667520388 has 36 divisors (see below), whose sum is σ = 1776152560. Its totient is φ = 210795696.

The previous prime is 667520363. The next prime is 667520393. The reversal of 667520388 is 883025766.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 487270 + ... + 488637.

Almost surely, 2^667520388 is an apocalyptic number.

It is an amenable number.

667520388 is an abundant number, since it is smaller than the sum of its proper divisors (1108632172).

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

667520388 is a wasteful number, since it uses less digits than its factorization.

667520388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 975936 (or 975931 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 667520388 is about 25836.4159279107. The cubic root of 667520388 is about 873.9532028139.

The spelling of 667520388 in words is "six hundred sixty-seven million, five hundred twenty thousand, three hundred eighty-eight".