28479978 has 16 divisors (see below), whose sum is σ = 63288960. Its totient is φ = 9493308.

The previous prime is 28479961. The next prime is 28479989. The reversal of 28479978 is 87997482.

It is a super-2 number, since 2×28479978² = 1622218293760968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 527407 = 28479978 / (2 + 8 + 4 + 7 + 9 + 9 + 7 + 8).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 263650 + ... + 263757.

It is an arithmetic number, because the mean of its divisors is an integer number (3955560).

Almost surely, 2^28479978 is an apocalyptic number.

28479978 is an abundant number, since it is smaller than the sum of its proper divisors (34808982).

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

28479978 is a wasteful number, since it uses less digits than its factorization.

28479978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527418 (or 527412 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 28479978 is about 5336.6635644380. The cubic root of 28479978 is about 305.3841902261.

The spelling of 28479978 in words is "twenty-eight million, four hundred seventy-nine thousand, nine hundred seventy-eight".