56649881 has 6 divisors (see below), whose sum is σ = 56978382. Its totient is φ = 56322560.

The previous prime is 56649871. The next prime is 56649889. The reversal of 56649881 is 18894665.

It can be written as a sum of positive squares in 3 ways, for example, as 17774656 + 38875225 = 4216^2 + 6235^2 .

It is a de Polignac number, because none of the positive numbers 2^k-56649881 is a prime.

It is a super-2 number, since 2×56649881² = 6418418034628322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56649889) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 125945 + ... + 126393.

It is an arithmetic number, because the mean of its divisors is an integer number (9496397).

Almost surely, 2^56649881 is an apocalyptic number.

It is an amenable number.

56649881 is a deficient number, since it is larger than the sum of its proper divisors (328501).

56649881 is an frugal number, since it uses more digits than its factorization.

56649881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1179 (or 730 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 56649881 is about 7526.6115217939. The cubic root of 56649881 is about 384.0605215119.

The spelling of 56649881 in words is "fifty-six million, six hundred forty-nine thousand, eight hundred eighty-one".