81127722 has 32 divisors (see below), whose sum is σ = 175347648. Its totient is φ = 24875136.

The previous prime is 81127691. The next prime is 81127759. The reversal of 81127722 is 22772118.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 81127722.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22753 + ... + 26075.

It is an arithmetic number, because the mean of its divisors is an integer number (5479614).

Almost surely, 2^81127722 is an apocalyptic number.

81127722 is an abundant number, since it is smaller than the sum of its proper divisors (94219926).

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

81127722 is a wasteful number, since it uses less digits than its factorization.

81127722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3654.

The product of its digits is 3136, while the sum is 30.

The square root of 81127722 is about 9007.0928717317. The cubic root of 81127722 is about 432.9021677147.

The spelling of 81127722 in words is "eighty-one million, one hundred twenty-seven thousand, seven hundred twenty-two".