28397232 has 30 divisors (see below), whose sum is σ = 79473212. Its totient is φ = 9465696.

The previous prime is 28397227. The next prime is 28397251. The reversal of 28397232 is 23279382.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

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, 98458 + ... + 98745.

Almost surely, 2^28397232 is an apocalyptic number.

It is an amenable number.

28397232 is an abundant number, since it is smaller than the sum of its proper divisors (51075980).

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

28397232 is a wasteful number, since it uses less digits than its factorization.

28397232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197217 (or 197208 counting only the distinct ones).

The product of its digits is 36288, while the sum is 36.

The square root of 28397232 is about 5328.9053284891. The cubic root of 28397232 is about 305.0881479520.

The spelling of 28397232 in words is "twenty-eight million, three hundred ninety-seven thousand, two hundred thirty-two".