28172344635 has 12 divisors (see below), whose sum is σ = 48832064112. Its totient is φ = 15025250448.

The previous prime is 28172344621. The next prime is 28172344649. The reversal of 28172344635 is 53644327182.

28172344635 is a `hidden beast` number, since 2 + 8 + 1 + 7 + 2 + 3 + 4 + 4 + 635 = 666.

It is an interprime number because it is at equal distance from previous prime (28172344621) and next prime (28172344649).

It is not a de Polignac number, because 28172344635 - 2⁴ = 28172344619 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 626052103 = 28172344635 / (2 + 8 + 1 + 7 + 2 + 3 + 4 + 4 + 6 + 3 + 5).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 313026007 + ... + 313026096.

It is an arithmetic number, because the mean of its divisors is an integer number (4069338676).

Almost surely, 2^28172344635 is an apocalyptic number.

28172344635 is a deficient number, since it is larger than the sum of its proper divisors (20659719477).

28172344635 is a wasteful number, since it uses less digits than its factorization.

28172344635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626052114 (or 626052111 counting only the distinct ones).

The product of its digits is 967680, while the sum is 45.

The spelling of 28172344635 in words is "twenty-eight billion, one hundred seventy-two million, three hundred forty-four thousand, six hundred thirty-five".