28430639685 has 128 divisors (see below), whose sum is σ = 58785792000. Its totient is φ = 12768627456.

The previous prime is 28430639663. The next prime is 28430639711. The reversal of 28430639685 is 58693603482.

It is not a de Polignac number, because 28430639685 - 2⁷ = 28430639557 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 17095164 + ... + 17096826.

It is an arithmetic number, because the mean of its divisors is an integer number (459264000).

Almost surely, 2^28430639685 is an apocalyptic number.

It is an amenable number.

28430639685 is an abundant number, since it is smaller than the sum of its proper divisors (30355152315).

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

28430639685 is a wasteful number, since it uses less digits than its factorization.

28430639685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992 (or 1986 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 54.

The spelling of 28430639685 in words is "twenty-eight billion, four hundred thirty million, six hundred thirty-nine thousand, six hundred eighty-five".