28112881600 has 84 divisors (see below), whose sum is σ = 72182973744. Its totient is φ = 10756218880.

The previous prime is 28112881597. The next prime is 28112881603. The reversal of 28112881600 is 618821182.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28112881597) and next prime (28112881603).

It is a super-2 number, since 2×28112881600² (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 28112881600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28112881603) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 345169 + ... + 418768.

It is an arithmetic number, because the mean of its divisors is an integer number (859321116).

Almost surely, 2^28112881600 is an apocalyptic number.

28112881600 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28112881600 is an abundant number, since it is smaller than the sum of its proper divisors (44070092144).

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

28112881600 is a wasteful number, since it uses less digits than its factorization.

28112881600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 763982 (or 763967 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 37.

The spelling of 28112881600 in words is "twenty-eight billion, one hundred twelve million, eight hundred eighty-one thousand, six hundred".