56737021 has 48 divisors (see below), whose sum is σ = 72777600. Its totient is φ = 43908480.

The previous prime is 56737019. The next prime is 56737027. The reversal of 56737021 is 12073765.

It is not a de Polignac number, because 56737021 - 2¹ = 56737019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56737027) 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 47 ways as a sum of consecutive naturals, for example, 1533415 + ... + 1533451.

It is an arithmetic number, because the mean of its divisors is an integer number (1516200).

Almost surely, 2^56737021 is an apocalyptic number.

It is an amenable number.

56737021 is a deficient number, since it is larger than the sum of its proper divisors (16040579).

56737021 is a wasteful number, since it uses less digits than its factorization.

56737021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130 (or 119 counting only the distinct ones).

The product of its (nonzero) digits is 8820, while the sum is 31.

The square root of 56737021 is about 7532.3980909137. The cubic root of 56737021 is about 384.2573438647.

The spelling of 56737021 in words is "fifty-six million, seven hundred thirty-seven thousand, twenty-one".