81335274 has 32 divisors (see below), whose sum is σ = 167101440. Its totient is φ = 26378352.

The previous prime is 81335251. The next prime is 81335297. The reversal of 81335274 is 47253318.

It is an interprime number because it is at equal distance from previous prime (81335251) and next prime (81335297).

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 94257 + ... + 95115.

It is an arithmetic number, because the mean of its divisors is an integer number (5221920).

Almost surely, 2^81335274 is an apocalyptic number.

81335274 is an abundant number, since it is smaller than the sum of its proper divisors (85766166).

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

81335274 is a wasteful number, since it uses less digits than its factorization.

81335274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1274.

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

The square root of 81335274 is about 9018.6070986600. The cubic root of 81335274 is about 433.2710231248.

The spelling of 81335274 in words is "eighty-one million, three hundred thirty-five thousand, two hundred seventy-four".