28445872 has 60 divisors (see below), whose sum is σ = 69068496. Its totient is φ = 11249280.

The previous prime is 28445863. The next prime is 28445881. The reversal of 28445872 is 27854482.

It is an interprime number because it is at equal distance from previous prime (28445863) and next prime (28445881).

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, 8797 + ... + 11587.

Almost surely, 2^28445872 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28445872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34534248).

28445872 is an abundant number, since it is smaller than the sum of its proper divisors (40622624).

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

28445872 is a wasteful number, since it uses less digits than its factorization.

28445872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2826 (or 2813 counting only the distinct ones).

The product of its digits is 143360, while the sum is 40.

The square root of 28445872 is about 5333.4671649875. The cubic root of 28445872 is about 305.2622379596.

The spelling of 28445872 in words is "twenty-eight million, four hundred forty-five thousand, eight hundred seventy-two".