28133651831 has 4 divisors (see below), whose sum is σ = 28348412664. Its totient is φ = 27918891000.

The previous prime is 28133651809. The next prime is 28133651857. The reversal of 28133651831 is 13815633182.

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 28133651831 - 2²² = 28129457527 is a prime.

It is a super-2 number, since 2×28133651831² (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 (28133654831) 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, 107380220 + ... + 107380481.

It is an arithmetic number, because the mean of its divisors is an integer number (7087103166).

Almost surely, 2^28133651831 is an apocalyptic number.

28133651831 is a deficient number, since it is larger than the sum of its proper divisors (214760833).

28133651831 is a wasteful number, since it uses less digits than its factorization.

28133651831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 214760832.

The product of its digits is 103680, while the sum is 41.

The spelling of 28133651831 in words is "twenty-eight billion, one hundred thirty-three million, six hundred fifty-one thousand, eight hundred thirty-one".