28666724 has 12 divisors (see below), whose sum is σ = 51333744. Its totient is φ = 13999944.

The previous prime is 28666721. The next prime is 28666727. The reversal of 28666724 is 42766682.

It is an interprime number because it is at equal distance from previous prime (28666721) and next prime (28666727).

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28666721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83162 + ... + 83505.

It is an arithmetic number, because the mean of its divisors is an integer number (4277812).

Almost surely, 2^28666724 is an apocalyptic number.

It is an amenable number.

28666724 is a deficient number, since it is larger than the sum of its proper divisors (22667020).

28666724 is a wasteful number, since it uses less digits than its factorization.

28666724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166714 (or 166712 counting only the distinct ones).

The product of its digits is 193536, while the sum is 41.

The square root of 28666724 is about 5354.1314888598. The cubic root of 28666724 is about 306.0502146081.

The spelling of 28666724 in words is "twenty-eight million, six hundred sixty-six thousand, seven hundred twenty-four".