81353286 has 24 divisors (see below), whose sum is σ = 201446544. Its totient is φ = 23243760.

The previous prime is 81353263. The next prime is 81353309. The reversal of 81353286 is 68235318.

It is an interprime number because it is at equal distance from previous prime (81353263) and next prime (81353309).

It is a self number, because there is not a number n which added to its sum of digits gives 81353286.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 322705 + ... + 322956.

It is an arithmetic number, because the mean of its divisors is an integer number (8393606).

Almost surely, 2^81353286 is an apocalyptic number.

81353286 is an abundant number, since it is smaller than the sum of its proper divisors (120093258).

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

81353286 is a wasteful number, since it uses less digits than its factorization.

81353286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 645676 (or 645673 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 81353286 is about 9019.6056454814. The cubic root of 81353286 is about 433.3030039259.

The spelling of 81353286 in words is "eighty-one million, three hundred fifty-three thousand, two hundred eighty-six".