81396286 has 4 divisors (see below), whose sum is σ = 122094432. Its totient is φ = 40698142.

The previous prime is 81396283. The next prime is 81396311. The reversal of 81396286 is 68269318.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81396281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20349070 + ... + 20349073.

It is an arithmetic number, because the mean of its divisors is an integer number (30523608).

Almost surely, 2^81396286 is an apocalyptic number.

81396286 is a deficient number, since it is larger than the sum of its proper divisors (40698146).

81396286 is a wasteful number, since it uses less digits than its factorization.

81396286 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40698145.

The product of its digits is 124416, while the sum is 43.

The square root of 81396286 is about 9021.9890268166. The cubic root of 81396286 is about 433.3793325265.

The spelling of 81396286 in words is "eighty-one million, three hundred ninety-six thousand, two hundred eighty-six".