56640402 has 96 divisors (see below), whose sum is σ = 152705280. Its totient is φ = 14774400.

The previous prime is 56640383. The next prime is 56640407. The reversal of 56640402 is 20404665.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (56640407) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 247224 + ... + 247452.

It is an arithmetic number, because the mean of its divisors is an integer number (1590680).

Almost surely, 2^56640402 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56640402, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76352640).

56640402 is an abundant number, since it is smaller than the sum of its proper divisors (96064878).

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

56640402 is a wasteful number, since it uses less digits than its factorization.

56640402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 56640402 is about 7525.9817964170. The cubic root of 56640402 is about 384.0390992089.

The spelling of 56640402 in words is "fifty-six million, six hundred forty thousand, four hundred two".