28126639493 has 8 divisors (see below), whose sum is σ = 29629326720. Its totient is φ = 26626186080.

The previous prime is 28126639397. The next prime is 28126639507. The reversal of 28126639493 is 39493662182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28126639493 - 2²⁸ = 27858204037 is a prime.

It is a super-2 number, since 2×28126639493² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28126639693) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 532568 + ... + 582993.

It is an arithmetic number, because the mean of its divisors is an integer number (3703665840).

Almost surely, 2^28126639493 is an apocalyptic number.

It is an amenable number.

28126639493 is a deficient number, since it is larger than the sum of its proper divisors (1502687227).

28126639493 is a wasteful number, since it uses less digits than its factorization.

28126639493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1116907.

The product of its digits is 3359232, while the sum is 53.

The spelling of 28126639493 in words is "twenty-eight billion, one hundred twenty-six million, six hundred thirty-nine thousand, four hundred ninety-three".