28131787344 has 40 divisors (see below), whose sum is σ = 72681767712. Its totient is φ = 9376232320.

The previous prime is 28131787331. The next prime is 28131787367. The reversal of 28131787344 is 44378713182.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 28131787293 and 28131787302.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 499999 + ... + 553409.

Almost surely, 2^28131787344 is an apocalyptic number.

28131787344 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28131787344 is an abundant number, since it is smaller than the sum of its proper divisors (44549980368).

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

28131787344 is a wasteful number, since it uses less digits than its factorization.

28131787344 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64395 (or 64389 counting only the distinct ones).

The product of its digits is 903168, while the sum is 48.

The spelling of 28131787344 in words is "twenty-eight billion, one hundred thirty-one million, seven hundred eighty-seven thousand, three hundred forty-four".