28928812 has 12 divisors (see below), whose sum is σ = 55227816. Its totient is φ = 13149440.

The previous prime is 28928807. The next prime is 28928813. The reversal of 28928812 is 21882982.

It is not an unprimeable number, because it can be changed into a prime (28928813) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328693 + ... + 328780.

It is an arithmetic number, because the mean of its divisors is an integer number (4602318).

Almost surely, 2^28928812 is an apocalyptic number.

28928812 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28928812 is a deficient number, since it is larger than the sum of its proper divisors (26299004).

28928812 is a wasteful number, since it uses less digits than its factorization.

28928812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657488 (or 657486 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The square root of 28928812 is about 5378.5511060136. The cubic root of 28928812 is about 306.9800833773.

The spelling of 28928812 in words is "twenty-eight million, nine hundred twenty-eight thousand, eight hundred twelve".