28403683872 has 24 divisors (see below), whose sum is σ = 74559670416. Its totient is φ = 9467894592.

The previous prime is 28403683849. The next prime is 28403683873. The reversal of 28403683872 is 27838630482.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28403683873) 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, 147935758 + ... + 147935949.

It is an arithmetic number, because the mean of its divisors is an integer number (3106652934).

Almost surely, 2^28403683872 is an apocalyptic number.

It is an amenable number.

28403683872 is an abundant number, since it is smaller than the sum of its proper divisors (46155986544).

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

28403683872 is a wasteful number, since it uses less digits than its factorization.

28403683872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295871720 (or 295871712 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 51.

The spelling of 28403683872 in words is "twenty-eight billion, four hundred three million, six hundred eighty-three thousand, eight hundred seventy-two".