81419874 has 32 divisors (see below), whose sum is σ = 166036416. Its totient is φ = 26611200.

The previous prime is 81419873. The next prime is 81419881. The reversal of 81419874 is 47891418.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (81419873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135174 + ... + 135774.

It is an arithmetic number, because the mean of its divisors is an integer number (5188638).

Almost surely, 2^81419874 is an apocalyptic number.

81419874 is an abundant number, since it is smaller than the sum of its proper divisors (84616542).

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

81419874 is a wasteful number, since it uses less digits than its factorization.

81419874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1010.

The product of its digits is 64512, while the sum is 42.

The square root of 81419874 is about 9023.2961826596. The cubic root of 81419874 is about 433.4211917844.

The spelling of 81419874 in words is "eighty-one million, four hundred nineteen thousand, eight hundred seventy-four".