660928128 has 64 divisors (see below), whose sum is σ = 2006397120. Its totient is φ = 188835840.

The previous prime is 660928117. The next prime is 660928139. The reversal of 660928128 is 821829066.

It is an interprime number because it is at equal distance from previous prime (660928117) and next prime (660928139).

It is a tau number, because it is divible by the number of its divisors (64).

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

It is a self number, because there is not a number n which added to its sum of digits gives 660928128.

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, 120253 + ... + 125628.

It is an arithmetic number, because the mean of its divisors is an integer number (31349955).

Almost surely, 2^660928128 is an apocalyptic number.

It is an amenable number.

660928128 is an abundant number, since it is smaller than the sum of its proper divisors (1345468992).

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

660928128 is a wasteful number, since it uses less digits than its factorization.

660928128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 245905 (or 245893 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 660928128 is about 25708.5224779644. The cubic root of 660928128 is about 871.0667005758.

The spelling of 660928128 in words is "six hundred sixty million, nine hundred twenty-eight thousand, one hundred twenty-eight".