28031173632 has 1188 divisors, whose sum is σ = 112973274960. Its totient is φ = 6897623040.

The previous prime is 28031173609. The next prime is 28031173633. The reversal of 28031173632 is 23637113082.

28031173632 is a `hidden beast` number, since 2 + 8 + 0 + 3 + 1 + 17 + 3 + 632 = 666.

It is a tau number, because it is divible by the number of its divisors (1188).

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 (28031173633) by changing a digit.

It is a polite number, since it can be written in 107 ways as a sum of consecutive naturals, for example, 1475324919 + ... + 1475324937.

Almost surely, 2^28031173632 is an apocalyptic number.

28031173632 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28031173632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56486637480).

28031173632 is an abundant number, since it is smaller than the sum of its proper divisors (84942101328).

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

28031173632 is a wasteful number, since it uses less digits than its factorization.

28031173632 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90 (or 42 counting only the distinct ones).

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

The spelling of 28031173632 in words is "twenty-eight billion, thirty-one million, one hundred seventy-three thousand, six hundred thirty-two".