667948640 has 48 divisors (see below), whose sum is σ = 1579807152. Its totient is φ = 266878464.

The previous prime is 667948639. The next prime is 667948691. The reversal of 667948640 is 46849766.

It is a super-3 number, since 3×667948640³ (a number of 27 digits) contains 333 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, 188162 + ... + 191678.

It is an arithmetic number, because the mean of its divisors is an integer number (32912649).

Almost surely, 2^667948640 is an apocalyptic number.

It is an amenable number.

667948640 is an abundant number, since it is smaller than the sum of its proper divisors (911858512).

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

667948640 is a wasteful number, since it uses less digits than its factorization.

667948640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4719 (or 4711 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 50.

The square root of 667948640 is about 25844.7023585105. The cubic root of 667948640 is about 874.1400596267.

The spelling of 667948640 in words is "six hundred sixty-seven million, nine hundred forty-eight thousand, six hundred forty".