655772680 has 32 divisors (see below), whose sum is σ = 1494172800. Its totient is φ = 258987456.

The previous prime is 655772659. The next prime is 655772683. The reversal of 655772680 is 86277556.

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

It is a self number, because there is not a number n which added to its sum of digits gives 655772680.

It is not an unprimeable number, because it can be changed into a prime (655772683) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100602 + ... + 106921.

It is an arithmetic number, because the mean of its divisors is an integer number (46692900).

Almost surely, 2^655772680 is an apocalyptic number.

It is an amenable number.

655772680 is an abundant number, since it is smaller than the sum of its proper divisors (838400120).

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

655772680 is a wasteful number, since it uses less digits than its factorization.

655772680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207613 (or 207609 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 46.

The square root of 655772680 is about 25608.0588877798. The cubic root of 655772680 is about 868.7959209720.

The spelling of 655772680 in words is "six hundred fifty-five million, seven hundred seventy-two thousand, six hundred eighty".