81733299 has 8 divisors (see below), whose sum is σ = 109393152. Its totient is φ = 54281160.

The previous prime is 81733279. The next prime is 81733303. The reversal of 81733299 is 99233718.

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

It is not a de Polignac number, because 81733299 - 2¹³ = 81725107 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 81733299.

It is not an unprimeable number, because it can be changed into a prime (81733279) 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, 51007 + ... + 52584.

It is an arithmetic number, because the mean of its divisors is an integer number (13674144).

Almost surely, 2^81733299 is an apocalyptic number.

81733299 is a deficient number, since it is larger than the sum of its proper divisors (27659853).

81733299 is a wasteful number, since it uses less digits than its factorization.

81733299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103857.

The product of its digits is 81648, while the sum is 42.

The square root of 81733299 is about 9040.6470454277. The cubic root of 81733299 is about 433.9766298727.

The spelling of 81733299 in words is "eighty-one million, seven hundred thirty-three thousand, two hundred ninety-nine".