28399715232 has 48 divisors (see below), whose sum is σ = 85199147712. Its totient is φ = 8114204160.

The previous prime is 28399715231. The next prime is 28399715237. The reversal of 28399715232 is 23251799382.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (28399715231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21130069 + ... + 21131412.

It is an arithmetic number, because the mean of its divisors is an integer number (1774982244).

Almost surely, 2^28399715232 is an apocalyptic number.

It is an amenable number.

28399715232 is an abundant number, since it is smaller than the sum of its proper divisors (56799432480).

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

28399715232 is a wasteful number, since it uses less digits than its factorization.

28399715232 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42261501 (or 42261493 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 51.

The spelling of 28399715232 in words is "twenty-eight billion, three hundred ninety-nine million, seven hundred fifteen thousand, two hundred thirty-two".