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64774081 = 2971163193
BaseRepresentation
bin1111011100010…
…1111111000001
311111212212100001
43313011333001
5113040232311
610232200001
71414366501
oct367057701
9144785301
1064774081
11336217a9
1219839001
131055bc78
148861a01
155a474c1
hex3dc5fc1

64774081 has 16 divisors (see below), whose sum is σ = 68722560. Its totient is φ = 60963840.

The previous prime is 64774079. The next prime is 64774103. The reversal of 64774081 is 18047746.

It is a 2-Lehmer number, since φ(64774081) divides (64774081-1)2.

It is a cyclic number.

It is a Carmichael number.

It is not a de Polignac number, because 64774081 - 21 = 64774079 is a prime.

It is a super-2 number, since 2×647740812 = 8391363138789122, which contains 22 as substring.

It is a deceptive number, since it divides R64774080.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64774081.

It is not an unprimeable number, because it can be changed into a prime (64774001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 335521 + ... + 335713.

It is an arithmetic number, because the mean of its divisors is an integer number (4295160).

It is a Poulet number, since it divides 264774080-1.

Almost surely, 264774081 is an apocalyptic number.

It is an amenable number.

64774081 is a deficient number, since it is larger than the sum of its proper divisors (3948479).

64774081 is a wasteful number, since it uses less digits than its factorization.

64774081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456.

The product of its (nonzero) digits is 37632, while the sum is 37.

The square root of 64774081 is about 8048.2346511518. The cubic root of 64774081 is about 401.6062103378.

The spelling of 64774081 in words is "sixty-four million, seven hundred seventy-four thousand, eighty-one".

Divisors: 1 29 71 163 193 2059 4727 5597 11573 13703 31459 335617 397387 912311 2233589 64774081