81750822 has 16 divisors (see below), whose sum is σ = 164407152. Its totient is φ = 27099360.

The previous prime is 81750821. The next prime is 81750827. The reversal of 81750822 is 22805718.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81750821) 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, 36553 + ... + 38724.

It is an arithmetic number, because the mean of its divisors is an integer number (10275447).

Almost surely, 2^81750822 is an apocalyptic number.

81750822 is an abundant number, since it is smaller than the sum of its proper divisors (82656330).

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

81750822 is a wasteful number, since it uses less digits than its factorization.

81750822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75463.

The product of its (nonzero) digits is 8960, while the sum is 33.

The square root of 81750822 is about 9041.6161166022. The cubic root of 81750822 is about 434.0076414236.

The spelling of 81750822 in words is "eighty-one million, seven hundred fifty thousand, eight hundred twenty-two".