56409640 has 64 divisors (see below), whose sum is σ = 150076800. Its totient is φ = 18670848.

The previous prime is 56409637. The next prime is 56409641. The reversal of 56409640 is 4690465.

It is a junction number, because it is equal to n+sod(n) for n = 56409596 and 56409605.

It is not an unprimeable number, because it can be changed into a prime (56409641) 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, 4647 + ... + 11593.

It is an arithmetic number, because the mean of its divisors is an integer number (2344950).

Almost surely, 2^56409640 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 56409640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75038400).

56409640 is an abundant number, since it is smaller than the sum of its proper divisors (93667160).

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

56409640 is a wasteful number, since it uses less digits than its factorization.

56409640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6994 (or 6990 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 34.

The square root of 56409640 is about 7510.6351262726. The cubic root of 56409640 is about 383.5168438723.

The spelling of 56409640 in words is "fifty-six million, four hundred nine thousand, six hundred forty".