28978832 has 20 divisors (see below), whose sum is σ = 56363580. Its totient is φ = 14433408.

The previous prime is 28978823. The next prime is 28978867. The reversal of 28978832 is 23887982.

It can be written as a sum of positive squares in 2 ways, for example, as 17172736 + 11806096 = 4144^2 + 3436^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 938 + ... + 7670.

It is an arithmetic number, because the mean of its divisors is an integer number (2818179).

Almost surely, 2^28978832 is an apocalyptic number.

It is an amenable number.

28978832 is a deficient number, since it is larger than the sum of its proper divisors (27384748).

28978832 is a wasteful number, since it uses less digits than its factorization.

28978832 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7010 (or 7004 counting only the distinct ones).

The product of its digits is 387072, while the sum is 47.

The square root of 28978832 is about 5383.1990488928. The cubic root of 28978832 is about 307.1569117265.

The spelling of 28978832 in words is "twenty-eight million, nine hundred seventy-eight thousand, eight hundred thirty-two".