28874364840 has 80 divisors (see below), whose sum is σ = 97049959380. Its totient is φ = 7699829760.

The previous prime is 28874364829. The next prime is 28874364853. The reversal of 28874364840 is 4846347882.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28488713796 + 385651044 = 168786^2 + 19638^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4452681 + ... + 4459160.

Almost surely, 2^28874364840 is an apocalyptic number.

28874364840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28874364840 is an abundant number, since it is smaller than the sum of its proper divisors (68175594540).

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

28874364840 is a wasteful number, since it uses less digits than its factorization.

28874364840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8911864 (or 8911851 counting only the distinct ones).

The product of its (nonzero) digits is 8257536, while the sum is 54.

The spelling of 28874364840 in words is "twenty-eight billion, eight hundred seventy-four million, three hundred sixty-four thousand, eight hundred forty".