978821904 has 80 divisors (see below), whose sum is σ = 2573835264. Its totient is φ = 320476800.

The previous prime is 978821873. The next prime is 978821923. The reversal of 978821904 is 409128879.

It is a super-3 number, since 3×978821904³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 1713939 + ... + 1714509.

Almost surely, 2^978821904 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 978821904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1286917632).

978821904 is an abundant number, since it is smaller than the sum of its proper divisors (1595013360).

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

978821904 is a wasteful number, since it uses less digits than its factorization.

978821904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1156 (or 1150 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 48.

The square root of 978821904 is about 31286.1295784570. The cubic root of 978821904 is about 992.8902052839.

The spelling of 978821904 in words is "nine hundred seventy-eight million, eight hundred twenty-one thousand, nine hundred four".