978408992 has 24 divisors (see below), whose sum is σ = 2101356432. Its totient is φ = 444731200.

The previous prime is 978408923. The next prime is 978408997. The reversal of 978408992 is 299804879.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (978408997) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1389434 + ... + 1390137.

It is an arithmetic number, because the mean of its divisors is an integer number (87556518).

Almost surely, 2^978408992 is an apocalyptic number.

It is an amenable number.

978408992 is an abundant number, since it is smaller than the sum of its proper divisors (1122947440).

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

978408992 is a wasteful number, since it uses less digits than its factorization.

978408992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2779592 (or 2779584 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 56.

The square root of 978408992 is about 31279.5299197414. The cubic root of 978408992 is about 992.7505700955.

The spelling of 978408992 in words is "nine hundred seventy-eight million, four hundred eight thousand, nine hundred ninety-two".