28331427971 has 16 divisors (see below), whose sum is σ = 35326429440. Its totient is φ = 22073856480.

The previous prime is 28331427967. The next prime is 28331427977. The reversal of 28331427971 is 17972413382.

It is a cyclic number.

It is not a de Polignac number, because 28331427971 - 2² = 28331427967 is a prime.

It is a super-2 number, since 2×28331427971² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28331427977) 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, 891365 + ... + 922601.

It is an arithmetic number, because the mean of its divisors is an integer number (2207901840).

Almost surely, 2^28331427971 is an apocalyptic number.

28331427971 is a deficient number, since it is larger than the sum of its proper divisors (6995001469).

28331427971 is a wasteful number, since it uses less digits than its factorization.

28331427971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43034.

The product of its digits is 508032, while the sum is 47.

The spelling of 28331427971 in words is "twenty-eight billion, three hundred thirty-one million, four hundred twenty-seven thousand, nine hundred seventy-one".