28139178916 has 48 divisors (see below), whose sum is σ = 50499368640. Its totient is φ = 13716172800.

The previous prime is 28139178911. The next prime is 28139178929. The reversal of 28139178916 is 61987193182.

It is a happy number.

It is a Smith number, since the sum of its digits (55) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28139178911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12912715 + ... + 12914893.

It is an arithmetic number, because the mean of its divisors is an integer number (1052070180).

Almost surely, 2^28139178916 is an apocalyptic number.

It is an amenable number.

28139178916 is a deficient number, since it is larger than the sum of its proper divisors (22360189724).

28139178916 is a wasteful number, since it uses less digits than its factorization.

28139178916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2764 (or 2762 counting only the distinct ones).

The product of its digits is 1306368, while the sum is 55.

The spelling of 28139178916 in words is "twenty-eight billion, one hundred thirty-nine million, one hundred seventy-eight thousand, nine hundred sixteen".