660698880 has 288 divisors, whose sum is σ = 2317896000. Its totient is φ = 159645696.

The previous prime is 660698879. The next prime is 660698891. The reversal of 660698880 is 88896066.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1892946 + ... + 1893294.

It is an arithmetic number, because the mean of its divisors is an integer number (8048250).

Almost surely, 2^660698880 is an apocalyptic number.

660698880 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660698880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1158948000).

660698880 is an abundant number, since it is smaller than the sum of its proper divisors (1657197120).

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

660698880 is a wasteful number, since it uses less digits than its factorization.

660698880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 419 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 995328, while the sum is 51.

The square root of 660698880 is about 25704.0634919851. The cubic root of 660698880 is about 870.9659768697.

The spelling of 660698880 in words is "six hundred sixty million, six hundred ninety-eight thousand, eight hundred eighty".