28697588 has 12 divisors (see below), whose sum is σ = 51952740. Its totient is φ = 13853952.

The previous prime is 28697573. The next prime is 28697597. The reversal of 28697588 is 88579682.

It can be written as a sum of positive squares in 2 ways, for example, as 21418384 + 7279204 = 4628^2 + 2698^2 .

It is a congruent number.

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, 123581 + ... + 123812.

It is an arithmetic number, because the mean of its divisors is an integer number (4329395).

Almost surely, 2^28697588 is an apocalyptic number.

It is an amenable number.

28697588 is a deficient number, since it is larger than the sum of its proper divisors (23255152).

28697588 is a wasteful number, since it uses less digits than its factorization.

28697588 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 247426 (or 247424 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 53.

The square root of 28697588 is about 5357.0129736636. The cubic root of 28697588 is about 306.1600114334.

The spelling of 28697588 in words is "twenty-eight million, six hundred ninety-seven thousand, five hundred eighty-eight".