28971827631 has 16 divisors (see below), whose sum is σ = 44401269600. Its totient is φ = 18648532224.

The previous prime is 28971827611. The next prime is 28971827707. The reversal of 28971827631 is 13672817982.

It is a happy number.

It is not a de Polignac number, because 28971827631 - 2⁹ = 28971827119 is a prime.

It is a super-2 number, since 2×28971827631² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28971827611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18499746 + ... + 18501311.

It is an arithmetic number, because the mean of its divisors is an integer number (2775079350).

Almost surely, 2^28971827631 is an apocalyptic number.

28971827631 is a deficient number, since it is larger than the sum of its proper divisors (15429441969).

28971827631 is a wasteful number, since it uses less digits than its factorization.

28971827631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37001095 (or 37001089 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The spelling of 28971827631 in words is "twenty-eight billion, nine hundred seventy-one million, eight hundred twenty-seven thousand, six hundred thirty-one".