81022942 has 32 divisors (see below), whose sum is σ = 163183104. Its totient is φ = 29138400.

The previous prime is 81022937. The next prime is 81022943. The reversal of 81022942 is 24922018.

It is a self number, because there is not a number n which added to its sum of digits gives 81022942.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81022943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18234 + ... + 22237.

It is an arithmetic number, because the mean of its divisors is an integer number (5099472).

Almost surely, 2^81022942 is an apocalyptic number.

81022942 is an abundant number, since it is smaller than the sum of its proper divisors (82160162).

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

81022942 is a wasteful number, since it uses less digits than its factorization.

81022942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40504.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 81022942 is about 9001.2744653188. The cubic root of 81022942 is about 432.7157167296.

The spelling of 81022942 in words is "eighty-one million, twenty-two thousand, nine hundred forty-two".