81895674 has 32 divisors (see below), whose sum is σ = 187479936. Its totient is φ = 23362560.

The previous prime is 81895673. The next prime is 81895687. The reversal of 81895674 is 47659818.

It is not an unprimeable number, because it can be changed into a prime (81895673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38314 + ... + 40394.

It is an arithmetic number, because the mean of its divisors is an integer number (5858748).

Almost surely, 2^81895674 is an apocalyptic number.

81895674 is an abundant number, since it is smaller than the sum of its proper divisors (105584262).

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

81895674 is a wasteful number, since it uses less digits than its factorization.

81895674 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3030.

The product of its digits is 483840, while the sum is 48.

The square root of 81895674 is about 9049.6228650701. The cubic root of 81895674 is about 434.2638255172.

The spelling of 81895674 in words is "eighty-one million, eight hundred ninety-five thousand, six hundred seventy-four".