256117432 has 8 divisors (see below), whose sum is σ = 480220200. Its totient is φ = 128058712.

The previous prime is 256117423. The next prime is 256117451. The reversal of 256117432 is 234711652.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×256117432² = 131192277948549248, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 256117394 and 256117403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16007332 + ... + 16007347.

It is an arithmetic number, because the mean of its divisors is an integer number (60027525).

Almost surely, 2^256117432 is an apocalyptic number.

It is an amenable number.

256117432 is a deficient number, since it is larger than the sum of its proper divisors (224102768).

256117432 is a wasteful number, since it uses less digits than its factorization.

256117432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32014685 (or 32014681 counting only the distinct ones).

The product of its digits is 10080, while the sum is 31.

The square root of 256117432 is about 16003.6693292507. The cubic root of 256117432 is about 635.0574953623.

The spelling of 256117432 in words is "two hundred fifty-six million, one hundred seventeen thousand, four hundred thirty-two".