28158805191790 has 96 divisors (see below), whose sum is σ = 64079097334560. Its totient is φ = 8830037857536.

The previous prime is 28158805191761. The next prime is 28158805191821. The reversal of 28158805191790 is 9719150885182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 19583352 + ... + 20972011.

It is an arithmetic number, because the mean of its divisors is an integer number (667490597235).

Almost surely, 2^{28158805191790} is an apocalyptic number.

28158805191790 is an abundant number, since it is smaller than the sum of its proper divisors (35920292142770).

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

28158805191790 is a wasteful number, since it uses less digits than its factorization.

28158805191790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40555506 (or 40555499 counting only the distinct ones).

The product of its (nonzero) digits is 14515200, while the sum is 64.

The spelling of 28158805191790 in words is "twenty-eight trillion, one hundred fifty-eight billion, eight hundred five million, one hundred ninety-one thousand, seven hundred ninety".