56721707 has 16 divisors (see below), whose sum is σ = 72253440. Its totient is φ = 43348608.

The previous prime is 56721677. The next prime is 56721757. The reversal of 56721707 is 70712765.

It is a cyclic number.

It is not a de Polignac number, because 56721707 - 2¹⁰ = 56720683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56721757) 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, 10283 + ... + 14804.

It is an arithmetic number, because the mean of its divisors is an integer number (4515840).

Almost surely, 2^56721707 is an apocalyptic number.

56721707 is a deficient number, since it is larger than the sum of its proper divisors (15531733).

56721707 is a wasteful number, since it uses less digits than its factorization.

56721707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25130.

The product of its (nonzero) digits is 20580, while the sum is 35.

The square root of 56721707 is about 7531.3814801801. The cubic root of 56721707 is about 384.2227688708. Note that the first 3 decimals are identical.

The spelling of 56721707 in words is "fifty-six million, seven hundred twenty-one thousand, seven hundred seven".