81333654 has 16 divisors (see below), whose sum is σ = 163021248. Its totient is φ = 27052232.

The previous prime is 81333649. The next prime is 81333667. The reversal of 81333654 is 45633318.

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 7 ways as a sum of consecutive naturals, for example, 11712 + ... + 17315.

It is an arithmetic number, because the mean of its divisors is an integer number (10188828).

Almost surely, 2^81333654 is an apocalyptic number.

81333654 is an abundant number, since it is smaller than the sum of its proper divisors (81687594).

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

81333654 is a wasteful number, since it uses less digits than its factorization.

81333654 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29499.

The product of its digits is 25920, while the sum is 33.

The square root of 81333654 is about 9018.5172838998. The cubic root of 81333654 is about 433.2681465389.

The spelling of 81333654 in words is "eighty-one million, three hundred thirty-three thousand, six hundred fifty-four".