27399728525 has 72 divisors (see below), whose sum is σ = 39952833480. Its totient is φ = 18505428480.

The previous prime is 27399728519. The next prime is 27399728539. The reversal of 27399728525 is 52582799372.

It can be written as a sum of positive squares in 12 ways, for example, as 8045910601 + 19353817924 = 89699^2 + 139118^2 .

It is not a de Polignac number, because 27399728525 - 2²⁶ = 27332619661 is a prime.

It is a super-3 number, since 3×27399728525³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 71 ways as a sum of consecutive naturals, for example, 3398399 + ... + 3406451.

It is an arithmetic number, because the mean of its divisors is an integer number (554900465).

Almost surely, 2^27399728525 is an apocalyptic number.

27399728525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

27399728525 is a deficient number, since it is larger than the sum of its proper divisors (12553104955).

27399728525 is a wasteful number, since it uses less digits than its factorization.

27399728525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8143 (or 8119 counting only the distinct ones).

The product of its digits is 19051200, while the sum is 59.

The spelling of 27399728525 in words is "twenty-seven billion, three hundred ninety-nine million, seven hundred twenty-eight thousand, five hundred twenty-five".