28409236 has 12 divisors (see below), whose sum is σ = 49759360. Its totient is φ = 14192280.

The previous prime is 28409233. The next prime is 28409243. The reversal of 28409236 is 63290482.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28409231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3805 + ... + 8443.

Almost surely, 2^28409236 is an apocalyptic number.

It is an amenable number.

28409236 is a deficient number, since it is larger than the sum of its proper divisors (21350124).

28409236 is a wasteful number, since it uses less digits than its factorization.

28409236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6174 (or 6172 counting only the distinct ones).

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

The square root of 28409236 is about 5330.0315196066. The cubic root of 28409236 is about 305.1311305710.

The spelling of 28409236 in words is "twenty-eight million, four hundred nine thousand, two hundred thirty-six".