28626902291 has 16 divisors (see below), whose sum is σ = 31847117568. Its totient is φ = 25553404800.

The previous prime is 28626902287. The next prime is 28626902299. The reversal of 28626902291 is 19220962682.

It is a cyclic number.

It is not a de Polignac number, because 28626902291 - 2² = 28626902287 is a prime.

It is a super-2 number, since 2×28626902291² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28626902299) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 530825 + ... + 582261.

It is an arithmetic number, because the mean of its divisors is an integer number (1990444848).

Almost surely, 2^28626902291 is an apocalyptic number.

28626902291 is a deficient number, since it is larger than the sum of its proper divisors (3220215277).

28626902291 is a wasteful number, since it uses less digits than its factorization.

28626902291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52862.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 28626902291 in words is "twenty-eight billion, six hundred twenty-six million, nine hundred two thousand, two hundred ninety-one".