56724921 has 48 divisors (see below), whose sum is σ = 93844800. Its totient is φ = 33834240.

The previous prime is 56724919. The next prime is 56724949. The reversal of 56724921 is 12942765.

56724921 is a `hidden beast` number, since 567 + 2 + 4 + 92 + 1 = 666.

It is not a de Polignac number, because 56724921 - 2¹ = 56724919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56724991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 316810 + ... + 316988.

It is an arithmetic number, because the mean of its divisors is an integer number (1955100).

Almost surely, 2^56724921 is an apocalyptic number.

It is an amenable number.

56724921 is a deficient number, since it is larger than the sum of its proper divisors (37119879).

56724921 is a wasteful number, since it uses less digits than its factorization.

56724921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 290 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

The square root of 56724921 is about 7531.5948510259. The cubic root of 56724921 is about 384.2300257554.

The spelling of 56724921 in words is "fifty-six million, seven hundred twenty-four thousand, nine hundred twenty-one".