28781275732 has 12 divisors (see below), whose sum is σ = 54946071936. Its totient is φ = 13082398040.

The previous prime is 28781275547. The next prime is 28781275739. The reversal of 28781275732 is 23757218782.

It is a super-2 number, since 2×28781275732² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 28781275732.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28781275739) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 327059908 + ... + 327059995.

It is an arithmetic number, because the mean of its divisors is an integer number (4578839328).

Almost surely, 2^28781275732 is an apocalyptic number.

28781275732 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28781275732 is a deficient number, since it is larger than the sum of its proper divisors (26164796204).

28781275732 is a wasteful number, since it uses less digits than its factorization.

28781275732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654119918 (or 654119916 counting only the distinct ones).

The product of its digits is 2634240, while the sum is 52.

The spelling of 28781275732 in words is "twenty-eight billion, seven hundred eighty-one million, two hundred seventy-five thousand, seven hundred thirty-two".