28131436225 has 24 divisors (see below), whose sum is σ = 36130455360. Its totient is φ = 21702246720.

The previous prime is 28131436211. The next prime is 28131436247. The reversal of 28131436225 is 52263413182.

It is not a de Polignac number, because 28131436225 - 2¹⁹ = 28130911937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 573102 + ... + 620248.

It is an arithmetic number, because the mean of its divisors is an integer number (1505435640).

Almost surely, 2^28131436225 is an apocalyptic number.

28131436225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28131436225 is a deficient number, since it is larger than the sum of its proper divisors (7999019135).

28131436225 is a wasteful number, since it uses less digits than its factorization.

28131436225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48009 (or 48004 counting only the distinct ones).

The product of its digits is 69120, while the sum is 37.

The spelling of 28131436225 in words is "twenty-eight billion, one hundred thirty-one million, four hundred thirty-six thousand, two hundred twenty-five".