28297936 has 20 divisors (see below), whose sum is σ = 54970564. Its totient is φ = 14112000.

The previous prime is 28297921. The next prime is 28297943. The reversal of 28297936 is 63979282.

It can be written as a sum of positive squares in 2 ways, for example, as 672400 + 27625536 = 820^2 + 5256^2 .

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, 4636 + ... + 8836.

Almost surely, 2^28297936 is an apocalyptic number.

It is an amenable number.

28297936 is a deficient number, since it is larger than the sum of its proper divisors (26672628).

28297936 is a wasteful number, since it uses less digits than its factorization.

28297936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4630 (or 4624 counting only the distinct ones).

The product of its digits is 326592, while the sum is 46.

The square root of 28297936 is about 5319.5804345832. The cubic root of 28297936 is about 304.7321342510.

The spelling of 28297936 in words is "twenty-eight million, two hundred ninety-seven thousand, nine hundred thirty-six".