28880978 has 16 divisors (see below), whose sum is σ = 50138880. Its totient is φ = 12220416.

The previous prime is 28880963. The next prime is 28880989. The reversal of 28880978 is 87908882.

It is a super-2 number, since 2×28880978² = 1668221780472968, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11951 + ... + 14162.

It is an arithmetic number, because the mean of its divisors is an integer number (3133680).

Almost surely, 2^28880978 is an apocalyptic number.

28880978 is a deficient number, since it is larger than the sum of its proper divisors (21257902).

28880978 is a wasteful number, since it uses less digits than its factorization.

28880978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26201.

The product of its (nonzero) digits is 516096, while the sum is 50.

The square root of 28880978 is about 5374.1025297253. The cubic root of 28880978 is about 306.8107921050.

The spelling of 28880978 in words is "twenty-eight million, eight hundred eighty thousand, nine hundred seventy-eight".