28491732 has 54 divisors (see below), whose sum is σ = 73514714. Its totient is φ = 9303840.

The previous prime is 28491721. The next prime is 28491751. The reversal of 28491732 is 23719482.

It can be written as a sum of positive squares in only one way, i.e., 21958596 + 6533136 = 4686^2 + 2556^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 181398 + ... + 181554.

Almost surely, 2^28491732 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 28491732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36757357).

28491732 is an abundant number, since it is smaller than the sum of its proper divisors (45022982).

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

28491732 is a wasteful number, since it uses less digits than its factorization.

28491732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309 (or 233 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 28491732 is about 5337.7647006964. The cubic root of 28491732 is about 305.4261962520.

The spelling of 28491732 in words is "twenty-eight million, four hundred ninety-one thousand, seven hundred thirty-two".