28724022 has 24 divisors (see below), whose sum is σ = 62843664. Its totient is φ = 9481104.

The previous prime is 28724009. The next prime is 28724027. The reversal of 28724022 is 22042782.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28724027) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5893 + ... + 9600.

It is an arithmetic number, because the mean of its divisors is an integer number (2618486).

Almost surely, 2^28724022 is an apocalyptic number.

28724022 is an abundant number, since it is smaller than the sum of its proper divisors (34119642).

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

28724022 is a wasteful number, since it uses less digits than its factorization.

28724022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15604 (or 15601 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 28724022 is about 5359.4796389202. The cubic root of 28724022 is about 306.2539862316.

The spelling of 28724022 in words is "twenty-eight million, seven hundred twenty-four thousand, twenty-two".