56553640 has 64 divisors (see below), whose sum is σ = 149506560. Its totient is φ = 18981120.

The previous prime is 56553613. The next prime is 56553647. The reversal of 56553640 is 4635565.

It is a junction number, because it is equal to n+sod(n) for n = 56553596 and 56553605.

It is not an unprimeable number, because it can be changed into a prime (56553647) 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, 777 + ... + 10663.

It is an arithmetic number, because the mean of its divisors is an integer number (2336040).

Almost surely, 2^56553640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56553640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74753280).

56553640 is an abundant number, since it is smaller than the sum of its proper divisors (92952920).

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

56553640 is a wasteful number, since it uses less digits than its factorization.

56553640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9922 (or 9918 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 34.

The square root of 56553640 is about 7520.2154224464. The cubic root of 56553640 is about 383.8429081104.

The spelling of 56553640 in words is "fifty-six million, five hundred fifty-three thousand, six hundred forty".