667645400 has 48 divisors (see below), whose sum is σ = 1555146000. Its totient is φ = 266564480.

The previous prime is 667645397. The next prime is 667645409. The reversal of 667645400 is 4546766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667645409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 117014 + ... + 122586.

It is an arithmetic number, because the mean of its divisors is an integer number (32398875).

Almost surely, 2^667645400 is an apocalyptic number.

It is an amenable number.

667645400 is an abundant number, since it is smaller than the sum of its proper divisors (887500600).

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

667645400 is a wasteful number, since it uses less digits than its factorization.

667645400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6188 (or 6179 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 38.

The square root of 667645400 is about 25838.8351130619. The cubic root of 667645400 is about 874.0077568620.

The spelling of 667645400 in words is "six hundred sixty-seven million, six hundred forty-five thousand, four hundred".