978389280 has 240 divisors, whose sum is σ = 3767347584. Its totient is φ = 237150720.

The previous prime is 978389267. The next prime is 978389297. The reversal of 978389280 is 82983879.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 139129 + ... + 145991.

Almost surely, 2^978389280 is an apocalyptic number.

978389280 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 978389280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1883673792).

978389280 is an abundant number, since it is smaller than the sum of its proper divisors (2788958304).

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

978389280 is a wasteful number, since it uses less digits than its factorization.

978389280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6901 (or 6884 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 54.

The square root of 978389280 is about 31279.2148239050. The cubic root of 978389280 is about 992.7439030708.

The spelling of 978389280 in words is "nine hundred seventy-eight million, three hundred eighty-nine thousand, two hundred eighty".