28290788 has 18 divisors (see below), whose sum is σ = 52594626. Its totient is φ = 13312768.

The previous prime is 28290767. The next prime is 28290797. The reversal of 28290788 is 88709282.

It can be written as a sum of positive squares in 3 ways, for example, as 15745024 + 12545764 = 3968^2 + 3542^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11081 + ... + 13392.

Almost surely, 2^28290788 is an apocalyptic number.

It is an amenable number.

28290788 is a deficient number, since it is larger than the sum of its proper divisors (24303838).

28290788 is a wasteful number, since it uses less digits than its factorization.

28290788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24511 (or 24492 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 44.

The square root of 28290788 is about 5318.9085346526. The cubic root of 28290788 is about 304.7064738550.

The spelling of 28290788 in words is "twenty-eight million, two hundred ninety thousand, seven hundred eighty-eight".