56666664 has 96 divisors (see below), whose sum is σ = 168667200. Its totient is φ = 17107200.

The previous prime is 56666663. The next prime is 56666671. The reversal of 56666664 is 46666665.

It is a super-2 number, since 2×56666664² = 6422221617777792, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56666663) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30564 + ... + 32364.

It is an arithmetic number, because the mean of its divisors is an integer number (1756950).

Almost surely, 2^56666664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56666664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84333600).

56666664 is an abundant number, since it is smaller than the sum of its proper divisors (112000536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

56666664 is a wasteful number, since it uses less digits than its factorization.

56666664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855 (or 1848 counting only the distinct ones).

The product of its digits is 933120, while the sum is 45.

The square root of 56666664 is about 7527.7263499678. The cubic root of 56666664 is about 384.0984448120.

Subtracting from 56666664 its reverse (46666665), we obtain a palindrome (9999999).

The spelling of 56666664 in words is "fifty-six million, six hundred sixty-six thousand, six hundred sixty-four".