615978880 has 128 divisors (see below), whose sum is σ = 1634774400. Its totient is φ = 220047360.

The previous prime is 615978877. The next prime is 615978911. The reversal of 615978880 is 88879516.

It is a tau number, because it is divible by the number of its divisors (128).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 414619 + ... + 416101.

It is an arithmetic number, because the mean of its divisors is an integer number (12771675).

Almost surely, 2^615978880 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 615978880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (817387200).

615978880 is an abundant number, since it is smaller than the sum of its proper divisors (1018795520).

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

615978880 is a wasteful number, since it uses less digits than its factorization.

615978880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1572 (or 1560 counting only the distinct ones).

The product of its (nonzero) digits is 967680, while the sum is 52.

The square root of 615978880 is about 24818.9218138097. The cubic root of 615978880 is about 850.8544487499.

The spelling of 615978880 in words is "six hundred fifteen million, nine hundred seventy-eight thousand, eight hundred eighty".