56172040 has 32 divisors (see below), whose sum is σ = 128125080. Its totient is φ = 22159872.

The previous prime is 56172023. The next prime is 56172079. The reversal of 56172040 is 4027165.

It can be written as a sum of positive squares in 4 ways, for example, as 35976004 + 20196036 = 5998^2 + 4494^2 .

It is a junction number, because it is equal to n+sod(n) for n = 56171996 and 56172014.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6699 + ... + 12538.

Almost surely, 2^56172040 is an apocalyptic number.

It is an amenable number.

56172040 is an abundant number, since it is smaller than the sum of its proper divisors (71953040).

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

56172040 is a wasteful number, since it uses less digits than its factorization.

56172040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19321 (or 19317 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 25.

The square root of 56172040 is about 7494.8008645994. The cubic root of 56172040 is about 382.9776225544.

The spelling of 56172040 in words is "fifty-six million, one hundred seventy-two thousand, forty".