81325374 has 16 divisors (see below), whose sum is σ = 175162512. Its totient is φ = 25023168.

The previous prime is 81325351. The next prime is 81325379. The reversal of 81325374 is 47352318.

It is a super-2 number, since 2×81325374² = 13227632912479752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81325379) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 521239 + ... + 521394.

It is an arithmetic number, because the mean of its divisors is an integer number (10947657).

Almost surely, 2^81325374 is an apocalyptic number.

81325374 is an abundant number, since it is smaller than the sum of its proper divisors (93837138).

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

81325374 is a wasteful number, since it uses less digits than its factorization.

81325374 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1042651.

The product of its digits is 20160, while the sum is 33.

The square root of 81325374 is about 9018.0582167116. The cubic root of 81325374 is about 433.2534433919.

The spelling of 81325374 in words is "eighty-one million, three hundred twenty-five thousand, three hundred seventy-four".