28025134431 has 24 divisors (see below), whose sum is σ = 43473860784. Its totient is φ = 16012039680.

The previous prime is 28025134427. The next prime is 28025134441. The reversal of 28025134431 is 13443152082.

It is not a de Polignac number, because 28025134431 - 2² = 28025134427 is a prime.

It is a super-2 number, since 2×28025134431² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28025134392 and 28025134401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28025134441) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1917391 + ... + 1931951.

It is an arithmetic number, because the mean of its divisors is an integer number (1811410866).

Almost surely, 2^28025134431 is an apocalyptic number.

28025134431 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

28025134431 is a deficient number, since it is larger than the sum of its proper divisors (15448726353).

28025134431 is a wasteful number, since it uses less digits than its factorization.

28025134431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27671 (or 27664 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 28025134431 in words is "twenty-eight billion, twenty-five million, one hundred thirty-four thousand, four hundred thirty-one".