28684724 has 6 divisors (see below), whose sum is σ = 50198274. Its totient is φ = 14342360.

The previous prime is 28684709. The next prime is 28684727. The reversal of 28684724 is 42748682.

It can be written as a sum of positive squares in only one way, i.e., 19272100 + 9412624 = 4390^2 + 3068^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28684727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3585587 + ... + 3585594.

It is an arithmetic number, because the mean of its divisors is an integer number (8366379).

Almost surely, 2^28684724 is an apocalyptic number.

It is an amenable number.

28684724 is a deficient number, since it is larger than the sum of its proper divisors (21513550).

28684724 is a wasteful number, since it uses less digits than its factorization.

28684724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7171185 (or 7171183 counting only the distinct ones).

The product of its digits is 172032, while the sum is 41.

The square root of 28684724 is about 5355.8121699701. The cubic root of 28684724 is about 306.1142580991.

The spelling of 28684724 in words is "twenty-eight million, six hundred eighty-four thousand, seven hundred twenty-four".