28211000831 has 12 divisors (see below), whose sum is σ = 31293087840. Its totient is φ = 25405773120.

The previous prime is 28211000827. The next prime is 28211000887. The reversal of 28211000831 is 13800011282.

It is not a de Polignac number, because 28211000831 - 2² = 28211000827 is a prime.

It is a super-2 number, since 2×28211000831² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28211000831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28211000801) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2028791 + ... + 2042648.

It is an arithmetic number, because the mean of its divisors is an integer number (2607757320).

Almost surely, 2^28211000831 is an apocalyptic number.

28211000831 is a deficient number, since it is larger than the sum of its proper divisors (3082087009).

28211000831 is a wasteful number, since it uses less digits than its factorization.

28211000831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4071506 (or 4071493 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 26.

The spelling of 28211000831 in words is "twenty-eight billion, two hundred eleven million, eight hundred thirty-one", and thus it is an aban number.