28658788 has 6 divisors (see below), whose sum is σ = 50152886. Its totient is φ = 14329392.

The previous prime is 28658779. The next prime is 28658803. The reversal of 28658788 is 88785682.

It can be written as a sum of positive squares in only one way, i.e., 28643904 + 14884 = 5352^2 + 122^2 .

It is a super-2 number, since 2×28658788² = 1642652259257888, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3582345 + ... + 3582352.

Almost surely, 2^28658788 is an apocalyptic number.

It is an amenable number.

28658788 is a deficient number, since it is larger than the sum of its proper divisors (21494098).

28658788 is a wasteful number, since it uses less digits than its factorization.

28658788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7164701 (or 7164699 counting only the distinct ones).

The product of its digits is 1720320, while the sum is 52.

The square root of 28658788 is about 5353.3903276335. The cubic root of 28658788 is about 306.0219700289.

The spelling of 28658788 in words is "twenty-eight million, six hundred fifty-eight thousand, seven hundred eighty-eight".