81727325 has 12 divisors (see below), whose sum is σ = 103255668. Its totient is φ = 64147200.

The previous prime is 81727291. The next prime is 81727333. The reversal of 81727325 is 52372718.

It can be written as a sum of positive squares in 6 ways, for example, as 1194649 + 80532676 = 1093^2 + 8974^2 .

It is a de Polignac number, because none of the positive numbers 2^k-81727325 is a prime.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a Curzon number.

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 11 ways as a sum of consecutive naturals, for example, 29516 + ... + 32165.

It is an arithmetic number, because the mean of its divisors is an integer number (8604639).

Almost surely, 2^81727325 is an apocalyptic number.

It is an amenable number.

81727325 is a deficient number, since it is larger than the sum of its proper divisors (21528343).

81727325 is a wasteful number, since it uses less digits than its factorization.

81727325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61744 (or 61739 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 81727325 is about 9040.3166426846. The cubic root of 81727325 is about 433.9660562975.

The spelling of 81727325 in words is "eighty-one million, seven hundred twenty-seven thousand, three hundred twenty-five".