81136074 has 16 divisors (see below), whose sum is σ = 162983520. Its totient is φ = 26926800.

The previous prime is 81136051. The next prime is 81136091. The reversal of 81136074 is 47063118.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28152 + ... + 30899.

It is an arithmetic number, because the mean of its divisors is an integer number (10186470).

Almost surely, 2^81136074 is an apocalyptic number.

81136074 is an abundant number, since it is smaller than the sum of its proper divisors (81847446).

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

81136074 is a wasteful number, since it uses less digits than its factorization.

81136074 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59285.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 81136074 is about 9007.5564944107. The cubic root of 81136074 is about 432.9170227883.

The spelling of 81136074 in words is "eighty-one million, one hundred thirty-six thousand, seventy-four".