28922724 has 24 divisors (see below), whose sum is σ = 74985120. Its totient is φ = 9640872.

The previous prime is 28922713. The next prime is 28922737. The reversal of 28922724 is 42722982.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133794 + ... + 134009.

It is an arithmetic number, because the mean of its divisors is an integer number (3124380).

Almost surely, 2^28922724 is an apocalyptic number.

It is an amenable number.

28922724 is an abundant number, since it is smaller than the sum of its proper divisors (46062396).

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

28922724 is a wasteful number, since it uses less digits than its factorization.

28922724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267816 (or 267808 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 28922724 is about 5377.9851245611. The cubic root of 28922724 is about 306.9585474559.

It can be divided in two parts, 28922 and 724, that added together give a triangular number (29646 = T₂₄₃).

The spelling of 28922724 in words is "twenty-eight million, nine hundred twenty-two thousand, seven hundred twenty-four".