81272334 has 32 divisors (see below), whose sum is σ = 190963584. Its totient is φ = 22733280.

The previous prime is 81272333. The next prime is 81272339. The reversal of 81272334 is 43327218.

It is a super-3 number, since 3×81272334³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81272333) 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, 46504 + ... + 48219.

It is an arithmetic number, because the mean of its divisors is an integer number (5967612).

Almost surely, 2^81272334 is an apocalyptic number.

81272334 is an abundant number, since it is smaller than the sum of its proper divisors (109691250).

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

81272334 is a wasteful number, since it uses less digits than its factorization.

81272334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94752.

The product of its digits is 8064, while the sum is 30.

The square root of 81272334 is about 9015.1169709550. The cubic root of 81272334 is about 433.1592343357.

Subtracting from 81272334 its reverse (43327218), we obtain a triangular number (37945116 = T₈₇₁₁).

The spelling of 81272334 in words is "eighty-one million, two hundred seventy-two thousand, three hundred thirty-four".