667393940 has 24 divisors (see below), whose sum is σ = 1407121632. Its totient is φ = 265892000.

The previous prime is 667393931. The next prime is 667393963. The reversal of 667393940 is 49393766.

It is a super-2 number, since 2×667393940² = 890829342297447200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 61454 + ... + 71493.

It is an arithmetic number, because the mean of its divisors is an integer number (58630068).

Almost surely, 2^667393940 is an apocalyptic number.

It is an amenable number.

667393940 is an abundant number, since it is smaller than the sum of its proper divisors (739727692).

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

667393940 is a wasteful number, since it uses less digits than its factorization.

667393940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133207 (or 133205 counting only the distinct ones).

The product of its (nonzero) digits is 734832, while the sum is 47.

The square root of 667393940 is about 25833.9687233689. The cubic root of 667393940 is about 873.8980151796.

The spelling of 667393940 in words is "six hundred sixty-seven million, three hundred ninety-three thousand, nine hundred forty".