28889193915918 has 64 divisors (see below), whose sum is σ = 73404505152000. Its totient is φ = 8250103979712.

The previous prime is 28889193915797. The next prime is 28889193915973. The reversal of 28889193915918 is 81951939198882.

28889193915918 is a `hidden beast` number, since 2 + 8 + 8 + 8 + 9 + 19 + 3 + 9 + 1 + 591 + 8 = 666.

It is a super-2 number, since 2×28889193915918² (a number of 28 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (81) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17502948 + ... + 19082231.

It is an arithmetic number, because the mean of its divisors is an integer number (1146945393000).

Almost surely, 2^{28889193915918} is an apocalyptic number.

28889193915918 is an abundant number, since it is smaller than the sum of its proper divisors (44515311236082).

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

28889193915918 is a wasteful number, since it uses less digits than its factorization.

28889193915918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36587286 (or 36587280 counting only the distinct ones).

The product of its digits is 806215680, while the sum is 81.

The spelling of 28889193915918 in words is "twenty-eight trillion, eight hundred eighty-nine billion, one hundred ninety-three million, nine hundred fifteen thousand, nine hundred eighteen".