56890640 has 20 divisors (see below), whose sum is σ = 132270924. Its totient is φ = 22756224.

The previous prime is 56890621. The next prime is 56890643. The reversal of 56890640 is 4609865.

It can be written as a sum of positive squares in 2 ways, for example, as 44302336 + 12588304 = 6656^2 + 3548^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 56890594 and 56890603.

It is not an unprimeable number, because it can be changed into a prime (56890643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355487 + ... + 355646.

Almost surely, 2^56890640 is an apocalyptic number.

It is an amenable number.

56890640 is an abundant number, since it is smaller than the sum of its proper divisors (75380284).

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

56890640 is a wasteful number, since it uses less digits than its factorization.

56890640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711146 (or 711140 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 56890640 is about 7542.5884151265. The cubic root of 56890640 is about 384.6038315299.

The spelling of 56890640 in words is "fifty-six million, eight hundred ninety thousand, six hundred forty".