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228821697 = 32134147701
BaseRepresentation
bin11011010001110…
…00101011000001
3120221120100100200
431220320223001
5432034243242
634412235413
75445644436
oct1550705301
9527510320
10228821697
11108189145
126476bb69
1338538b70
1422565b8d
151514e04c
hexda38ac1

228821697 has 24 divisors (see below), whose sum is σ = 364634088. Its totient is φ = 137376000.

The previous prime is 228821689. The next prime is 228821713. The reversal of 228821697 is 796128822.

It can be written as a sum of positive squares in 4 ways, for example, as 3101121 + 225720576 = 1761^2 + 15024^2 .

It is not a de Polignac number, because 228821697 - 23 = 228821689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (228821627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19054 + ... + 28647.

It is an arithmetic number, because the mean of its divisors is an integer number (15193087).

Almost surely, 2228821697 is an apocalyptic number.

It is an amenable number.

228821697 is a deficient number, since it is larger than the sum of its proper divisors (135812391).

228821697 is a wasteful number, since it uses less digits than its factorization.

228821697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47761 (or 47758 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 228821697 is about 15126.8535062649. The cubic root of 228821697 is about 611.6444894744.

The spelling of 228821697 in words is "two hundred twenty-eight million, eight hundred twenty-one thousand, six hundred ninety-seven".

Divisors: 1 3 9 13 39 41 117 123 369 533 1599 4797 47701 143103 429309 620113 1860339 1955741 5581017 5867223 17601669 25424633 76273899 228821697