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84215045 = 525765537
BaseRepresentation
bin1010000010100…
…00010100000101
312212110120022202
411001100110011
5133024340140
612205004245
72041546625
oct501202405
9185416282
1084215045
11435a0012
1224253685
13145a7ab5
14b282885
1575d7915
hex5050505

84215045 has 8 divisors (see below), whose sum is σ = 101452824. Its totient is φ = 67108864.

The previous prime is 84214993. The next prime is 84215069. The reversal of 84215045 is 54051248.

84215045 is nontrivially palindromic in base 2, base 4 and base 16.

It can be written as a sum of positive squares in 4 ways, for example, as 62694724 + 21520321 = 7918^2 + 4639^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 13-Lehmer number, since φ(84215045) divides (84215045-1)13.

It is a cyclic number.

It is not a de Polignac number, because 84215045 - 26 = 84214981 is a prime.

It is a Duffinian number.

84215045 is an undulating number in base 16.

It is a zygodrome in base 4.

It is a junction number, because it is equal to n+sod(n) for n = 84214999 and 84215017.

It is a congruent number.

It is an unprimeable number.

In principle, a polygon with 84215045 sides can be constructed with ruler and compass.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31484 + ... + 34053.

It is an arithmetic number, because the mean of its divisors is an integer number (12681603).

Almost surely, 284215045 is an apocalyptic number.

It is an amenable number.

84215045 is a deficient number, since it is larger than the sum of its proper divisors (17237779).

84215045 is a wasteful number, since it uses less digits than its factorization.

84215045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65799.

The product of its (nonzero) digits is 6400, while the sum is 29.

The square root of 84215045 is about 9176.8755576176. The cubic root of 84215045 is about 438.3253231760.

The spelling of 84215045 in words is "eighty-four million, two hundred fifteen thousand, forty-five".

Divisors: 1 5 257 1285 65537 327685 16843009 84215045