28332972 has 72 divisors (see below), whose sum is σ = 74692800. Its totient is φ = 9047808.

The previous prime is 28332961. The next prime is 28332973. The reversal of 28332972 is 27923382.

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

It is not an unprimeable number, because it can be changed into a prime (28332973) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 118429 + ... + 118667.

It is an arithmetic number, because the mean of its divisors is an integer number (1037400).

Almost surely, 2^28332972 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 28332972, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37346400).

28332972 is an abundant number, since it is smaller than the sum of its proper divisors (46359828).

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

28332972 is a wasteful number, since it uses less digits than its factorization.

28332972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375 (or 370 counting only the distinct ones).

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

The square root of 28332972 is about 5322.8725327590. The cubic root of 28332972 is about 304.8578465033.

The spelling of 28332972 in words is "twenty-eight million, three hundred thirty-two thousand, nine hundred seventy-two".