978804 has 72 divisors (see below), whose sum is σ = 2751840. Its totient is φ = 303264.

The previous prime is 978799. The next prime is 978821. The reversal of 978804 is 408879.

978804 = 9³ + 10³ + ... + 44³.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

978804 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18442 + ... + 18494.

It is an arithmetic number, because the mean of its divisors is an integer number (38220).

2⁹⁷⁸⁸⁰⁴ 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 978804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1375920).

978804 is an abundant number, since it is smaller than the sum of its proper divisors (1773036).

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

978804 is a wasteful number, since it uses less digits than its factorization.

978804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91 (or 77 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 978804 is about 989.3452380236. The cubic root of 978804 is about 99.2884151471.

The spelling of 978804 in words is "nine hundred seventy-eight thousand, eight hundred four".