28311501232 has 80 divisors (see below), whose sum is σ = 64167400960. Its totient is φ = 11850748416.

The previous prime is 28311501143. The next prime is 28311501263. The reversal of 28311501232 is 23210511382.

It is a super-2 number, since 2×28311501232² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 28311501232.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 825319 + ... + 858937.

It is an arithmetic number, because the mean of its divisors is an integer number (802092512).

Almost surely, 2^28311501232 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 28311501232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32083700480).

28311501232 is an abundant number, since it is smaller than the sum of its proper divisors (35855899728).

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

28311501232 is a wasteful number, since it uses less digits than its factorization.

28311501232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33810 (or 33804 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

It can be divided in two parts, 2831150 and 1232, that added together give a palindrome (2832382).

The spelling of 28311501232 in words is "twenty-eight billion, three hundred eleven million, five hundred one thousand, two hundred thirty-two".