28231172280 has 96 divisors (see below), whose sum is σ = 93703521600. Its totient is φ = 7368131328.

The previous prime is 28231172267. The next prime is 28231172293. The reversal of 28231172280 is 8227113282.

28231172280 is a `hidden beast` number, since 282 + 31 + 1 + 72 + 280 = 666.

It is an interprime number because it is at equal distance from previous prime (28231172267) and next prime (28231172293).

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 23 ways as a sum of consecutive naturals, for example, 817335 + ... + 851174.

It is an arithmetic number, because the mean of its divisors is an integer number (976078350).

Almost surely, 2^28231172280 is an apocalyptic number.

28231172280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28231172280 is an abundant number, since it is smaller than the sum of its proper divisors (65472349320).

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

28231172280 is a wasteful number, since it uses less digits than its factorization.

28231172280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1668573 (or 1668566 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The spelling of 28231172280 in words is "twenty-eight billion, two hundred thirty-one million, one hundred seventy-two thousand, two hundred eighty".