28939992 has 32 divisors (see below), whose sum is σ = 72588480. Its totient is φ = 9614880.

The previous prime is 28939949. The next prime is 28939997. The reversal of 28939992 is 29993982.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28939997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6123 + ... + 9765.

It is an arithmetic number, because the mean of its divisors is an integer number (2268390).

Almost surely, 2^28939992 is an apocalyptic number.

It is an amenable number.

28939992 is an abundant number, since it is smaller than the sum of its proper divisors (43648488).

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

28939992 is a wasteful number, since it uses less digits than its factorization.

28939992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3983 (or 3979 counting only the distinct ones).

The product of its digits is 629856, while the sum is 51.

The square root of 28939992 is about 5379.5903189741. The cubic root of 28939992 is about 307.0196240643.

The spelling of 28939992 in words is "twenty-eight million, nine hundred thirty-nine thousand, nine hundred ninety-two".