28372224732 has 72 divisors (see below), whose sum is σ = 71821849344. Its totient is φ = 8711655168.

The previous prime is 28372224703. The next prime is 28372224737. The reversal of 28372224732 is 23742227382.

It is a super-2 number, since 2×28372224732² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28372224737) 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, 75963 + ... + 250029.

Almost surely, 2^28372224732 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 28372224732, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35910924672).

28372224732 is an abundant number, since it is smaller than the sum of its proper divisors (43449624612).

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

28372224732 is a wasteful number, since it uses less digits than its factorization.

28372224732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174155 (or 174136 counting only the distinct ones).

The product of its digits is 451584, while the sum is 42.

The spelling of 28372224732 in words is "twenty-eight billion, three hundred seventy-two million, two hundred twenty-four thousand, seven hundred thirty-two".