28080701685 has 24 divisors (see below), whose sum is σ = 48778834104. Its totient is φ = 14943876480.

The previous prime is 28080701669. The next prime is 28080701699. The reversal of 28080701685 is 58610708082.

It can be written as a sum of positive squares in 4 ways, for example, as 2611414404 + 25469287281 = 51102^2 + 159591^2 .

It is not a de Polignac number, because 28080701685 - 2⁴ = 28080701669 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 28080701685.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 656062 + ... + 697551.

It is an arithmetic number, because the mean of its divisors is an integer number (2032451421).

Almost surely, 2^28080701685 is an apocalyptic number.

It is an amenable number.

28080701685 is a deficient number, since it is larger than the sum of its proper divisors (20698132419).

28080701685 is a wasteful number, since it uses less digits than its factorization.

28080701685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1354085 (or 1354082 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The spelling of 28080701685 in words is "twenty-eight billion, eighty million, seven hundred one thousand, six hundred eighty-five".