28164531225 has 12 divisors (see below), whose sum is σ = 46565358416. Its totient is φ = 15021083280.

The previous prime is 28164531211. The next prime is 28164531229. The reversal of 28164531225 is 52213546182.

It is not a de Polignac number, because 28164531225 - 2¹⁴ = 28164514841 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28164531229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 187763467 + ... + 187763616.

Almost surely, 2^28164531225 is an apocalyptic number.

28164531225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28164531225 is a deficient number, since it is larger than the sum of its proper divisors (18400827191).

28164531225 is a wasteful number, since it uses less digits than its factorization.

28164531225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375527096 (or 375527091 counting only the distinct ones).

The product of its digits is 115200, while the sum is 39.

The spelling of 28164531225 in words is "twenty-eight billion, one hundred sixty-four million, five hundred thirty-one thousand, two hundred twenty-five".