659779920 has 60 divisors (see below), whose sum is σ = 2215763316. Its totient is φ = 175941120.

The previous prime is 659779919. The next prime is 659779951. The reversal of 659779920 is 29977956.

It can be written as a sum of positive squares in 2 ways, for example, as 415670544 + 244109376 = 20388^2 + 15624^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 457461 + ... + 458900.

Almost surely, 2^659779920 is an apocalyptic number.

659779920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

659779920 is an abundant number, since it is smaller than the sum of its proper divisors (1555983396).

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

659779920 is a wasteful number, since it uses less digits than its factorization.

659779920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 916380 (or 916371 counting only the distinct ones).

The product of its (nonzero) digits is 2143260, while the sum is 54.

The square root of 659779920 is about 25686.1814990084. The cubic root of 659779920 is about 870.5619833173.

The spelling of 659779920 in words is "six hundred fifty-nine million, seven hundred seventy-nine thousand, nine hundred twenty".