56737821 has 16 divisors (see below), whose sum is σ = 86772224. Its totient is φ = 32303664.

The previous prime is 56737817. The next prime is 56737841. The reversal of 56737821 is 12873765.

It is not a de Polignac number, because 56737821 - 2² = 56737817 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56737821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56737801) 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 15 ways as a sum of consecutive naturals, for example, 1170 + ... + 10716.

It is an arithmetic number, because the mean of its divisors is an integer number (5423264).

Almost surely, 2^56737821 is an apocalyptic number.

It is an amenable number.

56737821 is a deficient number, since it is larger than the sum of its proper divisors (30034403).

56737821 is a wasteful number, since it uses less digits than its factorization.

56737821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9840.

The product of its digits is 70560, while the sum is 39.

The square root of 56737821 is about 7532.4511946643. The cubic root of 56737821 is about 384.2591498838.

The spelling of 56737821 in words is "fifty-six million, seven hundred thirty-seven thousand, eight hundred twenty-one".