978618400730 has 32 divisors (see below), whose sum is σ = 1764077662224. Its totient is φ = 390877825536.

The previous prime is 978618400699. The next prime is 978618400751. The reversal of 978618400730 is 37004816879.

It can be written as a sum of positive squares in 8 ways, for example, as 249543208849 + 729075191881 = 499543^2 + 853859^2 .

It is a Curzon number.

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, 23238974 + ... + 23281046.

Almost surely, 2^978618400730 is an apocalyptic number.

978618400730 is a deficient number, since it is larger than the sum of its proper divisors (785459261494).

978618400730 is a wasteful number, since it uses less digits than its factorization.

978618400730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45410.

The product of its (nonzero) digits is 2032128, while the sum is 53.

The spelling of 978618400730 in words is "nine hundred seventy-eight billion, six hundred eighteen million, four hundred thousand, seven hundred thirty".