667765904 has 20 divisors (see below), whose sum is σ = 1393319676. Its totient is φ = 308199552.

The previous prime is 667765897. The next prime is 667765909. The reversal of 667765904 is 409567766.

It can be written as a sum of positive squares in 2 ways, for example, as 316128400 + 351637504 = 17780^2 + 18752^2 .

It is a super-2 number, since 2×667765904² = 891822605089874432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (667765909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1604999 + ... + 1605414.

Almost surely, 2^667765904 is an apocalyptic number.

It is an amenable number.

667765904 is an abundant number, since it is smaller than the sum of its proper divisors (725553772).

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

667765904 is a wasteful number, since it uses less digits than its factorization.

667765904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3210434 (or 3210428 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 50.

The square root of 667765904 is about 25841.1668467196. The cubic root of 667765904 is about 874.0603372162.

The spelling of 667765904 in words is "six hundred sixty-seven million, seven hundred sixty-five thousand, nine hundred four".