28706906225 has 6 divisors (see below), whose sum is σ = 35596563750. Its totient is φ = 22965524960.

The previous prime is 28706906203. The next prime is 28706906269. The reversal of 28706906225 is 52260960782.

It can be written as a sum of positive squares in 3 ways, for example, as 4564894096 + 24142012129 = 67564^2 + 155377^2 .

It is not a de Polignac number, because 28706906225 - 2²⁸ = 28438470769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28706906225.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 574138100 + ... + 574138149.

It is an arithmetic number, because the mean of its divisors is an integer number (5932760625).

Almost surely, 2^28706906225 is an apocalyptic number.

28706906225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28706906225 is a deficient number, since it is larger than the sum of its proper divisors (6889657525).

28706906225 is a wasteful number, since it uses less digits than its factorization.

28706906225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1148276259 (or 1148276254 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 47.

The spelling of 28706906225 in words is "twenty-eight billion, seven hundred six million, nine hundred six thousand, two hundred twenty-five".