655607980 has 24 divisors (see below), whose sum is σ = 1378641600. Its totient is φ = 261888000.

The previous prime is 655607951. The next prime is 655607987. The reversal of 655607980 is 89706556.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 655607980.

It is not an unprimeable number, because it can be changed into a prime (655607987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6805 + ... + 36844.

It is an arithmetic number, because the mean of its divisors is an integer number (57443400).

Almost surely, 2^655607980 is an apocalyptic number.

It is an amenable number.

655607980 is an abundant number, since it is smaller than the sum of its proper divisors (723033620).

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

655607980 is a wasteful number, since it uses less digits than its factorization.

655607980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44409 (or 44407 counting only the distinct ones).

The product of its (nonzero) digits is 453600, while the sum is 46.

The square root of 655607980 is about 25604.8429012951. The cubic root of 655607980 is about 868.7231809950.

The spelling of 655607980 in words is "six hundred fifty-five million, six hundred seven thousand, nine hundred eighty".