28780113687 has 16 divisors (see below), whose sum is σ = 41332529280. Its totient is φ = 17707737312.

The previous prime is 28780113643. The next prime is 28780113701. The reversal of 28780113687 is 78631108782.

It is not a de Polignac number, because 28780113687 - 2²² = 28775919383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28780113287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171864 + ... + 295122.

It is an arithmetic number, because the mean of its divisors is an integer number (2583283080).

Almost surely, 2^28780113687 is an apocalyptic number.

28780113687 is a deficient number, since it is larger than the sum of its proper divisors (12552415593).

28780113687 is a wasteful number, since it uses less digits than its factorization.

28780113687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129262.

The product of its (nonzero) digits is 903168, while the sum is 51.

The spelling of 28780113687 in words is "twenty-eight billion, seven hundred eighty million, one hundred thirteen thousand, six hundred eighty-seven".