28104072631 has 4 divisors (see below), whose sum is σ = 29757253392. Its totient is φ = 26450891872.

The previous prime is 28104072629. The next prime is 28104072673. The reversal of 28104072631 is 13627040182.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28104072631 - 2¹ = 28104072629 is a prime.

It is a super-2 number, since 2×28104072631² (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 (28104072611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826590355 + ... + 826590388.

It is an arithmetic number, because the mean of its divisors is an integer number (7439313348).

Almost surely, 2^28104072631 is an apocalyptic number.

28104072631 is a deficient number, since it is larger than the sum of its proper divisors (1653180761).

28104072631 is a wasteful number, since it uses less digits than its factorization.

28104072631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1653180760.

The product of its (nonzero) digits is 16128, while the sum is 34.

The spelling of 28104072631 in words is "twenty-eight billion, one hundred four million, seventy-two thousand, six hundred thirty-one".