978220800 has 648 divisors, whose sum is σ = 3944028816. Its totient is φ = 238878720.

The previous prime is 978220787. The next prime is 978220801. The reversal of 978220800 is 8022879.

It is a tau number, because it is divible by the number of its divisors (648).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978220801) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 26438382 + ... + 26438418.

Almost surely, 2^978220800 is an apocalyptic number.

978220800 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 978220800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1972014408).

978220800 is an abundant number, since it is smaller than the sum of its proper divisors (2965808016).

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

978220800 is a wasteful number, since it uses less digits than its factorization.

978220800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 64 counting only the distinct ones).

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

The square root of 978220800 is about 31276.5215457218. The cubic root of 978220800 is about 992.6869158375.

The spelling of 978220800 in words is "nine hundred seventy-eight million, two hundred twenty thousand, eight hundred".