81934287 has 8 divisors (see below), whose sum is σ = 110267136. Its totient is φ = 54112152.

The previous prime is 81934283. The next prime is 81934313. The reversal of 81934287 is 78243918.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 81934287 - 2² = 81934283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81934283) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127303 + ... + 127944.

It is an arithmetic number, because the mean of its divisors is an integer number (13783392).

Almost surely, 2^81934287 is an apocalyptic number.

81934287 is a deficient number, since it is larger than the sum of its proper divisors (28332849).

81934287 is a wasteful number, since it uses less digits than its factorization.

81934287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255357.

The product of its digits is 96768, while the sum is 42.

The square root of 81934287 is about 9051.7560174808. The cubic root of 81934287 is about 434.3320651592.

The spelling of 81934287 in words is "eighty-one million, nine hundred thirty-four thousand, two hundred eighty-seven".