81304134 has 32 divisors (see below), whose sum is σ = 168376320. Its totient is φ = 26145600.

The previous prime is 81304129. The next prime is 81304151. The reversal of 81304134 is 43140318.

It is a super-2 number, since 2×81304134² = 13220724410979912, which contains 22 as substring.

It is a congruent 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, 96487 + ... + 97325.

It is an arithmetic number, because the mean of its divisors is an integer number (5261760).

Almost surely, 2^81304134 is an apocalyptic number.

81304134 is an abundant number, since it is smaller than the sum of its proper divisors (87072186).

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

81304134 is a wasteful number, since it uses less digits than its factorization.

81304134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1396.

The product of its (nonzero) digits is 1152, while the sum is 24.

The square root of 81304134 is about 9016.8805027016. The cubic root of 81304134 is about 433.2157220596.

The spelling of 81304134 in words is "eighty-one million, three hundred four thousand, one hundred thirty-four".