56728945 has 16 divisors (see below), whose sum is σ = 83784960. Its totient is φ = 35907264.

The previous prime is 56728943. The next prime is 56728961. The reversal of 56728945 is 54982765.

It is a cyclic number.

It is not a de Polignac number, because 56728945 - 2¹ = 56728943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 56728895 and 56728904.

It is not an unprimeable number, because it can be changed into a prime (56728943) 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, 61885 + ... + 62794.

It is an arithmetic number, because the mean of its divisors is an integer number (5236560).

Almost surely, 2^56728945 is an apocalyptic number.

It is an amenable number.

56728945 is a deficient number, since it is larger than the sum of its proper divisors (27056015).

56728945 is a wasteful number, since it uses less digits than its factorization.

56728945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124704.

The product of its digits is 604800, while the sum is 46.

The square root of 56728945 is about 7531.8619875832. The cubic root of 56728945 is about 384.2391111512.

The spelling of 56728945 in words is "fifty-six million, seven hundred twenty-eight thousand, nine hundred forty-five".