659977980 has 48 divisors (see below), whose sum is σ = 1849073184. Its totient is φ = 175886080.

The previous prime is 659977963. The next prime is 659977993. The reversal of 659977980 is 89779956.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 162454 + ... + 166466.

It is an arithmetic number, because the mean of its divisors is an integer number (38522358).

Almost surely, 2^659977980 is an apocalyptic number.

659977980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

659977980 is an abundant number, since it is smaller than the sum of its proper divisors (1189095204).

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

659977980 is a wasteful number, since it uses less digits than its factorization.

659977980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6766 (or 6764 counting only the distinct ones).

The product of its (nonzero) digits is 8573040, while the sum is 60.

The square root of 659977980 is about 25690.0365900868. The cubic root of 659977980 is about 870.6490862288.

The spelling of 659977980 in words is "six hundred fifty-nine million, nine hundred seventy-seven thousand, nine hundred eighty".