660642460 has 48 divisors (see below), whose sum is σ = 1408730400. Its totient is φ = 260216064.

The previous prime is 660642431. The next prime is 660642473. The reversal of 660642460 is 64246066.

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, 389374 + ... + 391066.

It is an arithmetic number, because the mean of its divisors is an integer number (29348550).

Almost surely, 2^660642460 is an apocalyptic number.

It is an amenable number.

660642460 is an abundant number, since it is smaller than the sum of its proper divisors (748087940).

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

660642460 is a wasteful number, since it uses less digits than its factorization.

660642460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990 (or 1988 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 34.

The square root of 660642460 is about 25702.9659767117. The cubic root of 660642460 is about 870.9411842848.

The spelling of 660642460 in words is "six hundred sixty million, six hundred forty-two thousand, four hundred sixty".