56728442 has 16 divisors (see below), whose sum is σ = 88957440. Its totient is φ = 27080592.

The previous prime is 56728429. The next prime is 56728453. The reversal of 56728442 is 24482765.

It is a super-2 number, since 2×56728442² = 6436232263494728, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 56728396 and 56728405.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38984 + ... + 40412.

It is an arithmetic number, because the mean of its divisors is an integer number (5559840).

Almost surely, 2^56728442 is an apocalyptic number.

56728442 is a deficient number, since it is larger than the sum of its proper divisors (32228998).

56728442 is a wasteful number, since it uses less digits than its factorization.

56728442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317.

The product of its digits is 107520, while the sum is 38.

The square root of 56728442 is about 7531.8285960316. The cubic root of 56728442 is about 384.2379755002.

The spelling of 56728442 in words is "fifty-six million, seven hundred twenty-eight thousand, four hundred forty-two".