28000000831 has 8 divisors (see below), whose sum is σ = 30847886928. Its totient is φ = 25202520000.

The previous prime is 28000000829. The next prime is 28000000837. The reversal of 28000000831 is 13800000082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28000000831 - 2¹ = 28000000829 is a prime.

It is a super-2 number, since 2×28000000831² (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 (28000000837) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12600150 + ... + 12602371.

It is an arithmetic number, because the mean of its divisors is an integer number (3855985866).

Almost surely, 2^28000000831 is an apocalyptic number.

28000000831 is a deficient number, since it is larger than the sum of its proper divisors (2847886097).

28000000831 is a wasteful number, since it uses less digits than its factorization.

28000000831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25202633.

The product of its (nonzero) digits is 384, while the sum is 22.

The spelling of 28000000831 in words is "twenty-eight billion, eight hundred thirty-one", and thus it is an aban number.