28715138290 has 32 divisors (see below), whose sum is σ = 52120110960. Its totient is φ = 11390156544.

The previous prime is 28715138269. The next prime is 28715138323. The reversal of 28715138290 is 9283151782.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 17236801521 + 11478336769 = 131289^2 + 107137^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28715138290.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 781164 + ... + 817096.

Almost surely, 2^28715138290 is an apocalyptic number.

28715138290 is a deficient number, since it is larger than the sum of its proper divisors (23404972670).

28715138290 is a wasteful number, since it uses less digits than its factorization.

28715138290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36606.

The product of its (nonzero) digits is 241920, while the sum is 46.

The spelling of 28715138290 in words is "twenty-eight billion, seven hundred fifteen million, one hundred thirty-eight thousand, two hundred ninety".