28156831194 has 16 divisors (see below), whose sum is σ = 56327194368. Its totient is φ = 9383355072.

The previous prime is 28156831147. The next prime is 28156831223. The reversal of 28156831194 is 49113865182.

It is a happy number.

It is a super-2 number, since 2×28156831194² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 536682 + ... + 586805.

It is an arithmetic number, because the mean of its divisors is an integer number (3520449648).

Almost surely, 2^28156831194 is an apocalyptic number.

28156831194 is an abundant number, since it is smaller than the sum of its proper divisors (28170363174).

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

28156831194 is a wasteful number, since it uses less digits than its factorization.

28156831194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1127669.

The product of its digits is 414720, while the sum is 48.

The spelling of 28156831194 in words is "twenty-eight billion, one hundred fifty-six million, eight hundred thirty-one thousand, one hundred ninety-four".