28923988 has 24 divisors (see below), whose sum is σ = 52117632. Its totient is φ = 14038464.

The previous prime is 28923971. The next prime is 28923997. The reversal of 28923988 is 88932982.

It is a congruent number.

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, 25195 + ... + 26317.

It is an arithmetic number, because the mean of its divisors is an integer number (2171568).

Almost surely, 2^28923988 is an apocalyptic number.

It is an amenable number.

28923988 is a deficient number, since it is larger than the sum of its proper divisors (23193644).

28923988 is a wasteful number, since it uses less digits than its factorization.

28923988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311 (or 1309 counting only the distinct ones).

The product of its digits is 497664, while the sum is 49.

The square root of 28923988 is about 5378.1026394073. The cubic root of 28923988 is about 306.9630190258.

The spelling of 28923988 in words is "twenty-eight million, nine hundred twenty-three thousand, nine hundred eighty-eight".