56721266 has 16 divisors (see below), whose sum is σ = 101464704. Its totient is φ = 23252064.

The previous prime is 56721263. The next prime is 56721283. The reversal of 56721266 is 66212765.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56721263) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87755 + ... + 88398.

It is an arithmetic number, because the mean of its divisors is an integer number (6341544).

Almost surely, 2^56721266 is an apocalyptic number.

56721266 is a deficient number, since it is larger than the sum of its proper divisors (44743438).

56721266 is a wasteful number, since it uses less digits than its factorization.

56721266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176185.

The product of its digits is 30240, while the sum is 35.

The square root of 56721266 is about 7531.3522026260. The cubic root of 56721266 is about 384.2217731163.

The spelling of 56721266 in words is "fifty-six million, seven hundred twenty-one thousand, two hundred sixty-six".