28920612 has 24 divisors (see below), whose sum is σ = 77121856. Its totient is φ = 8263008.

The previous prime is 28920607. The next prime is 28920667. The reversal of 28920612 is 21602982.

It is a self number, because there is not a number n which added to its sum of digits gives 28920612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172063 + ... + 172230.

Almost surely, 2^28920612 is an apocalyptic number.

It is an amenable number.

28920612 is an abundant number, since it is smaller than the sum of its proper divisors (48201244).

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

28920612 is a wasteful number, since it uses less digits than its factorization.

28920612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 344307 (or 344305 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 28920612 is about 5377.7887649107. The cubic root of 28920612 is about 306.9510756812.

The spelling of 28920612 in words is "twenty-eight million, nine hundred twenty thousand, six hundred twelve".