978516640 has 36 divisors (see below), whose sum is σ = 2312680734. Its totient is φ = 391248384.

The previous prime is 978516613. The next prime is 978516659. The reversal of 978516640 is 46615879.

978516640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 937094544 + 41422096 = 30612^2 + 6436^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 394444 + ... + 396916.

Almost surely, 2^978516640 is an apocalyptic number.

It is an amenable number.

978516640 is an abundant number, since it is smaller than the sum of its proper divisors (1334164094).

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

978516640 is an frugal number, since it uses more digits than its factorization.

978516640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4961 (or 2480 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 978516640 is about 31281.2506143856. The cubic root of 978516640 is about 992.7869773972.

The spelling of 978516640 in words is "nine hundred seventy-eight million, five hundred sixteen thousand, six hundred forty".