660400088 has 32 divisors (see below), whose sum is σ = 1312750800. Its totient is φ = 310382592.

The previous prime is 660400073. The next prime is 660400109. The reversal of 660400088 is 880004066.

It is a super-2 number, since 2×660400088² = 872256552460815488, 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, 123731 + ... + 128957.

Almost surely, 2^660400088 is an apocalyptic number.

660400088 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

660400088 is a deficient number, since it is larger than the sum of its proper divisors (652350712).

660400088 is a wasteful number, since it uses less digits than its factorization.

660400088 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6179 (or 6175 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 660400088 is about 25698.2506797642. The cubic root of 660400088 is about 870.8346629366.

The spelling of 660400088 in words is "six hundred sixty million, four hundred thousand, eighty-eight".