56431690 has 32 divisors (see below), whose sum is σ = 117298944. Its totient is φ = 19146240.

The previous prime is 56431681. The next prime is 56431733. The reversal of 56431690 is 9613465.

It is a super-2 number, since 2×56431690² = 6369071272512200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2635 + ... + 10945.

It is an arithmetic number, because the mean of its divisors is an integer number (3665592).

Almost surely, 2^56431690 is an apocalyptic number.

56431690 is an abundant number, since it is smaller than the sum of its proper divisors (60867254).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56431690 is a wasteful number, since it uses less digits than its factorization.

56431690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8422.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 56431690 is about 7512.1029013186. The cubic root of 56431690 is about 383.5668084102.

It can be divided in two parts, 56431 and 690, that added together give a square (57121 = 239²).

The spelling of 56431690 in words is "fifty-six million, four hundred thirty-one thousand, six hundred ninety".