978428 has 24 divisors (see below), whose sum is σ = 1921584. Its totient is φ = 432000.

The previous prime is 978427. The next prime is 978449. The reversal of 978428 is 824879.

It is a junction number, because it is equal to n+sod(n) for n = 978391 and 978400.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 978428.

It is not an unprimeable number, because it can be changed into a prime (978427) 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, 1328 + ... + 1928.

It is an arithmetic number, because the mean of its divisors is an integer number (80066).

2⁹⁷⁸⁴²⁸ is an apocalyptic number.

It is an amenable number.

978428 is a deficient number, since it is larger than the sum of its proper divisors (943156).

978428 is a wasteful number, since it uses less digits than its factorization.

978428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653 (or 651 counting only the distinct ones).

The product of its digits is 32256, while the sum is 38.

The square root of 978428 is about 989.1551951034. The cubic root of 978428 is about 99.2756998927.

The spelling of 978428 in words is "nine hundred seventy-eight thousand, four hundred twenty-eight".