978728 has 32 divisors (see below), whose sum is σ = 1987200. Its totient is φ = 450432.

The previous prime is 978727. The next prime is 978743. The reversal of 978728 is 827879.

978728 = 102² + 103² + ... + 158².

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978728.

It is not an unprimeable number, because it can be changed into a prime (978727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7076 + ... + 7212.

It is an arithmetic number, because the mean of its divisors is an integer number (62100).

2⁹⁷⁸⁷²⁸ is an apocalyptic number.

It is an amenable number.

978728 is an abundant number, since it is smaller than the sum of its proper divisors (1008472).

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

978728 is a wasteful number, since it uses less digits than its factorization.

978728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209 (or 205 counting only the distinct ones).

The product of its digits is 56448, while the sum is 41.

The square root of 978728 is about 989.3068280367. The cubic root of 978728 is about 99.2858453051.

The spelling of 978728 in words is "nine hundred seventy-eight thousand, seven hundred twenty-eight".