28891152 has 60 divisors (see below), whose sum is σ = 81239964. Its totient is φ = 9584640.

The previous prime is 28891147. The next prime is 28891171. The reversal of 28891152 is 25119882.

It can be written as a sum of positive squares in 2 ways, for example, as 11048976 + 17842176 = 3324^2 + 4224^2 .

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 11 ways as a sum of consecutive naturals, for example, 44752 + ... + 45392.

Almost surely, 2^28891152 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 28891152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40619982).

28891152 is an abundant number, since it is smaller than the sum of its proper divisors (52348812).

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

28891152 is a wasteful number, since it uses less digits than its factorization.

28891152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 968 (or 959 counting only the distinct ones).

The product of its digits is 11520, while the sum is 36.

The square root of 28891152 is about 5375.0490230323. The cubic root of 28891152 is about 306.8468149679.

The spelling of 28891152 in words is "twenty-eight million, eight hundred ninety-one thousand, one hundred fifty-two".