667912560 has 80 divisors (see below), whose sum is σ = 2366324736. Its totient is φ = 152665344.

The previous prime is 667912547. The next prime is 667912613. The reversal of 667912560 is 65219766.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×667912560² = 892214375611507200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197104 + ... + 200463.

Almost surely, 2^667912560 is an apocalyptic number.

667912560 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

667912560 is an abundant number, since it is smaller than the sum of its proper divisors (1698412176).

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

667912560 is a wasteful number, since it uses less digits than its factorization.

667912560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397590 (or 397584 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 42.

The square root of 667912560 is about 25844.0043336941. The cubic root of 667912560 is about 874.1243201225.

The spelling of 667912560 in words is "six hundred sixty-seven million, nine hundred twelve thousand, five hundred sixty".