56728841 has 8 divisors (see below), whose sum is σ = 62094984. Its totient is φ = 51505920.

The previous prime is 56728817. The next prime is 56728849. The reversal of 56728841 is 14882765.

It can be written as a sum of positive squares in 4 ways, for example, as 1449616 + 55279225 = 1204^2 + 7435^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56728841 is a prime.

It is a super-2 number, since 2×56728841² = 6436322802406562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56728849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34976 + ... + 36561.

It is an arithmetic number, because the mean of its divisors is an integer number (7761873).

Almost surely, 2^56728841 is an apocalyptic number.

It is an amenable number.

56728841 is a deficient number, since it is larger than the sum of its proper divisors (5366143).

56728841 is a wasteful number, since it uses less digits than its factorization.

56728841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71611.

The product of its digits is 107520, while the sum is 41.

The square root of 56728841 is about 7531.8550835767. The cubic root of 56728841 is about 384.2388763451.

The spelling of 56728841 in words is "fifty-six million, seven hundred twenty-eight thousand, eight hundred forty-one".