28940236 has 36 divisors (see below), whose sum is σ = 56650944. Its totient is φ = 12916800.

The previous prime is 28940227. The next prime is 28940243. The reversal of 28940236 is 63204982.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 20266 + ... + 21646.

Almost surely, 2^28940236 is an apocalyptic number.

28940236 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28940236 is a deficient number, since it is larger than the sum of its proper divisors (27710708).

28940236 is a wasteful number, since it uses less digits than its factorization.

28940236 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1442 (or 1427 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 28940236 is about 5379.6129972332. The cubic root of 28940236 is about 307.0204869139.

The spelling of 28940236 in words is "twenty-eight million, nine hundred forty thousand, two hundred thirty-six".