979918640 has 80 divisors (see below), whose sum is σ = 2332231680. Its totient is φ = 382786560.

The previous prime is 979918637. The next prime is 979918661. The reversal of 979918640 is 46819979.

It is a happy number.

979918640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 765521 + ... + 766799.

It is an arithmetic number, because the mean of its divisors is an integer number (29152896).

Almost surely, 2^979918640 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 979918640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1166115840).

979918640 is an abundant number, since it is smaller than the sum of its proper divisors (1352313040).

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

979918640 is a wasteful number, since it uses less digits than its factorization.

979918640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1510 (or 1504 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 53.

The square root of 979918640 is about 31303.6521830920. The cubic root of 979918640 is about 993.2608998827.

The spelling of 979918640 in words is "nine hundred seventy-nine million, nine hundred eighteen thousand, six hundred forty".