669576564 has 96 divisors (see below), whose sum is σ = 1834004480. Its totient is φ = 210924000.

The previous prime is 669576553. The next prime is 669576577. The reversal of 669576564 is 465675966.

669576564 is a `hidden beast` number, since 6 + 6 + 9 + 5 + 76 + 564 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 669576564.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141639 + ... + 146289.

Almost surely, 2^669576564 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 669576564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917002240).

669576564 is an abundant number, since it is smaller than the sum of its proper divisors (1164427916).

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

669576564 is a wasteful number, since it uses less digits than its factorization.

669576564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4738 (or 4730 counting only the distinct ones).

The product of its digits is 8164800, while the sum is 54.

The square root of 669576564 is about 25876.1775384233. The cubic root of 669576564 is about 874.8496346788.

The spelling of 669576564 in words is "six hundred sixty-nine million, five hundred seventy-six thousand, five hundred sixty-four".