28881287836 has 12 divisors (see below), whose sum is σ = 50553352528. Its totient is φ = 14437472832.

The previous prime is 28881287791. The next prime is 28881287843. The reversal of 28881287836 is 63878218882.

It is a hoax number, since the sum of its digits (61) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772221 + ... + 808756.

Almost surely, 2^28881287836 is an apocalyptic number.

It is an amenable number.

28881287836 is a deficient number, since it is larger than the sum of its proper divisors (21672064692).

28881287836 is a wasteful number, since it uses less digits than its factorization.

28881287836 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1585548 (or 1585546 counting only the distinct ones).

The product of its digits is 16515072, while the sum is 61.

The spelling of 28881287836 in words is "twenty-eight billion, eight hundred eighty-one million, two hundred eighty-seven thousand, eight hundred thirty-six".