81022766 has 8 divisors (see below), whose sum is σ = 132582744. Its totient is φ = 36828520.

The previous prime is 81022763. The next prime is 81022769. The reversal of 81022766 is 66722018.

It is an interprime number because it is at equal distance from previous prime (81022763) and next prime (81022769).

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

It is a super-2 number, since 2×81022766² = 13129377220581512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81022763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1841405 + ... + 1841448.

It is an arithmetic number, because the mean of its divisors is an integer number (16572843).

Almost surely, 2^81022766 is an apocalyptic number.

81022766 is a deficient number, since it is larger than the sum of its proper divisors (51559978).

81022766 is a wasteful number, since it uses less digits than its factorization.

81022766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3682866.

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 81022766 is about 9001.2646889201. The cubic root of 81022766 is about 432.7154034108.

The spelling of 81022766 in words is "eighty-one million, twenty-two thousand, seven hundred sixty-six".