56621649 has 16 divisors (see below), whose sum is σ = 87910272. Its totient is φ = 31744128.

The previous prime is 56621641. The next prime is 56621657. The reversal of 56621649 is 94612665.

It is an interprime number because it is at equal distance from previous prime (56621641) and next prime (56621657).

It is not a de Polignac number, because 56621649 - 2³ = 56621641 is a prime.

It is a super-2 number, since 2×56621649² = 6412022270958402, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56621641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24324 + ... + 26549.

It is an arithmetic number, because the mean of its divisors is an integer number (5494392).

Almost surely, 2^56621649 is an apocalyptic number.

It is an amenable number.

56621649 is a deficient number, since it is larger than the sum of its proper divisors (31288623).

56621649 is a wasteful number, since it uses less digits than its factorization.

56621649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50936.

The product of its digits is 77760, while the sum is 39.

The square root of 56621649 is about 7524.7358093158. The cubic root of 56621649 is about 383.9967108551.

The spelling of 56621649 in words is "fifty-six million, six hundred twenty-one thousand, six hundred forty-nine".