28623375631 has 4 divisors (see below), whose sum is σ = 28768672152. Its totient is φ = 28478079112.

The previous prime is 28623375619. The next prime is 28623375673. The reversal of 28623375631 is 13657332682.

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

It is a cyclic number.

It is not a de Polignac number, because 28623375631 - 2⁹ = 28623375119 is a prime.

It is a super-2 number, since 2×28623375631² (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 (28623376631) 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, 72647965 + ... + 72648358.

It is an arithmetic number, because the mean of its divisors is an integer number (7192168038).

Almost surely, 2^28623375631 is an apocalyptic number.

28623375631 is a deficient number, since it is larger than the sum of its proper divisors (145296521).

28623375631 is a wasteful number, since it uses less digits than its factorization.

28623375631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145296520.

The product of its digits is 1088640, while the sum is 46.

The spelling of 28623375631 in words is "twenty-eight billion, six hundred twenty-three million, three hundred seventy-five thousand, six hundred thirty-one".