655440428720 has 320 divisors, whose sum is σ = 1986022886400. Its totient is φ = 199306598400.

The previous prime is 655440428717. The next prime is 655440428737. The reversal of 655440428720 is 27824044556.

655440428720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12348959 + ... + 12401921.

It is an arithmetic number, because the mean of its divisors is an integer number (6206321520).

Almost surely, 2^655440428720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655440428720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (993011443200).

655440428720 is an abundant number, since it is smaller than the sum of its proper divisors (1330582457680).

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

655440428720 is a wasteful number, since it uses less digits than its factorization.

655440428720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53049 (or 53029 counting only the distinct ones).

The product of its (nonzero) digits is 2150400, while the sum is 47.

The spelling of 655440428720 in words is "six hundred fifty-five billion, four hundred forty million, four hundred twenty-eight thousand, seven hundred twenty".