28707688 has 16 divisors (see below), whose sum is σ = 54565380. Its totient is φ = 14156928.

The previous prime is 28707677. The next prime is 28707737. The reversal of 28707688 is 88670782.

It can be written as a sum of positive squares in 2 ways, for example, as 28494244 + 213444 = 5338^2 + 462^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23995 + ... + 25162.

Almost surely, 2^28707688 is an apocalyptic number.

It is an amenable number.

28707688 is a deficient number, since it is larger than the sum of its proper divisors (25857692).

28707688 is a wasteful number, since it uses less digits than its factorization.

28707688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49236 (or 49232 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 46.

The square root of 28707688 is about 5357.9555802563. The cubic root of 28707688 is about 306.1959244798.

The spelling of 28707688 in words is "twenty-eight million, seven hundred seven thousand, six hundred eighty-eight".