28981874090 has 32 divisors (see below), whose sum is σ = 57101251536. Its totient is φ = 10525570560.

The previous prime is 28981874081. The next prime is 28981874107. The reversal of 28981874090 is 9047818982.

It can be written as a sum of positive squares in 8 ways, for example, as 3238634281 + 25743239809 = 56909^2 + 160447^2 .

It is a super-2 number, since 2×28981874090² (a number of 22 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1819427 + ... + 1835286.

Almost surely, 2^28981874090 is an apocalyptic number.

28981874090 is a deficient number, since it is larger than the sum of its proper divisors (28119377446).

28981874090 is a wasteful number, since it uses less digits than its factorization.

28981874090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3654794.

The product of its (nonzero) digits is 2322432, while the sum is 56.

The spelling of 28981874090 in words is "twenty-eight billion, nine hundred eighty-one million, eight hundred seventy-four thousand, ninety".