667224864 has 120 divisors (see below), whose sum is σ = 1996006320. Its totient is φ = 218588544.

The previous prime is 667224841. The next prime is 667224931. The reversal of 667224864 is 468422766.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 150747 + ... + 155109.

It is an arithmetic number, because the mean of its divisors is an integer number (16633386).

Almost surely, 2^667224864 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 667224864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (998003160).

667224864 is an abundant number, since it is smaller than the sum of its proper divisors (1328781456).

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

667224864 is a wasteful number, since it uses less digits than its factorization.

667224864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4444 (or 4427 counting only the distinct ones).

The product of its digits is 774144, while the sum is 45.

The square root of 667224864 is about 25830.6961578661. The cubic root of 667224864 is about 873.8242118624.

The spelling of 667224864 in words is "six hundred sixty-seven million, two hundred twenty-four thousand, eight hundred sixty-four".