28409232 has 40 divisors (see below), whose sum is σ = 76584384. Its totient is φ = 9057664.

The previous prime is 28409231. The next prime is 28409233. The reversal of 28409232 is 23290482.

It is an interprime number because it is at equal distance from previous prime (28409231) and next prime (28409233).

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 28409232.

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

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11763 + ... + 13970.

Almost surely, 2^28409232 is an apocalyptic number.

It is an amenable number.

28409232 is an abundant number, since it is smaller than the sum of its proper divisors (48175152).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28409232 is a wasteful number, since it uses less digits than its factorization.

28409232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25767 (or 25761 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 30.

The square root of 28409232 is about 5330.0311443743. The cubic root of 28409232 is about 305.1311162503.

The spelling of 28409232 in words is "twenty-eight million, four hundred nine thousand, two hundred thirty-two".