28390000639 has 64 divisors (see below), whose sum is σ = 39104271360. Its totient is φ = 19894533120.

The previous prime is 28390000579. The next prime is 28390000703. The reversal of 28390000639 is 93600009382.

It is not a de Polignac number, because 28390000639 - 2¹⁵ = 28389967871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28390000339) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 26556997 + ... + 26558065.

It is an arithmetic number, because the mean of its divisors is an integer number (611004240).

Almost surely, 2^28390000639 is an apocalyptic number.

28390000639 is a deficient number, since it is larger than the sum of its proper divisors (10714270721).

28390000639 is a wasteful number, since it uses less digits than its factorization.

28390000639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1760.

The product of its (nonzero) digits is 69984, while the sum is 40.

The spelling of 28390000639 in words is "twenty-eight billion, three hundred ninety million, six hundred thirty-nine", and thus it is an aban number.