56423640 has 128 divisors (see below), whose sum is σ = 208373760. Its totient is φ = 11902464.

The previous prime is 56423569. The next prime is 56423651. The reversal of 56423640 is 4632465.

56423640 = T₁₈₁ + T₁₈₂ + ... + T₇₀₀.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 56423598 and 56423607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8337 + ... + 13503.

It is an arithmetic number, because the mean of its divisors is an integer number (1627920).

Almost surely, 2^56423640 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 56423640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104186880).

56423640 is an abundant number, since it is smaller than the sum of its proper divisors (151950120).

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

56423640 is a wasteful number, since it uses less digits than its factorization.

56423640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5201 (or 5197 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

The square root of 56423640 is about 7511.5670801771. The cubic root of 56423640 is about 383.5485688971.

The spelling of 56423640 in words is "fifty-six million, four hundred twenty-three thousand, six hundred forty".