28170978 has 24 divisors (see below), whose sum is σ = 61931184. Its totient is φ = 8536440.

The previous prime is 28170953. The next prime is 28170979. The reversal of 28170978 is 87907182.

It is not an unprimeable number, because it can be changed into a prime (28170979) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18676 + ... + 20127.

It is an arithmetic number, because the mean of its divisors is an integer number (2580466).

Almost surely, 2^28170978 is an apocalyptic number.

28170978 is an abundant number, since it is smaller than the sum of its proper divisors (33760206).

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

28170978 is a wasteful number, since it uses less digits than its factorization.

28170978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38830 (or 38819 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 28170978 is about 5307.6339361339. The cubic root of 28170978 is about 304.2757265845.

The spelling of 28170978 in words is "twenty-eight million, one hundred seventy thousand, nine hundred seventy-eight".