81325038 has 16 divisors (see below), whose sum is σ = 167046480. Its totient is φ = 26375616.

The previous prime is 81325037. The next prime is 81325043. The reversal of 81325038 is 83052318.

It is a happy number.

It is a super-2 number, since 2×81325038² = 13227523611402888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81324996 and 81325014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81325031) 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 7 ways as a sum of consecutive naturals, for example, 182943 + ... + 183386.

It is an arithmetic number, because the mean of its divisors is an integer number (10440405).

Almost surely, 2^81325038 is an apocalyptic number.

81325038 is an abundant number, since it is smaller than the sum of its proper divisors (85721442).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81325038 is a wasteful number, since it uses less digits than its factorization.

81325038 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 366371.

The product of its (nonzero) digits is 5760, while the sum is 30.

The square root of 81325038 is about 9018.0395874048. The cubic root of 81325038 is about 433.2528467214.

The spelling of 81325038 in words is "eighty-one million, three hundred twenty-five thousand, thirty-eight".