81390022 has 8 divisors (see below), whose sum is σ = 139525776. Its totient is φ = 34881432.

The previous prime is 81390019. The next prime is 81390061. The reversal of 81390022 is 22009318.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2906773 + ... + 2906800.

It is an arithmetic number, because the mean of its divisors is an integer number (17440722).

Almost surely, 2^81390022 is an apocalyptic number.

81390022 is a deficient number, since it is larger than the sum of its proper divisors (58135754).

81390022 is a wasteful number, since it uses less digits than its factorization.

81390022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5813582.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 81390022 is about 9021.6418683076. The cubic root of 81390022 is about 433.3682150750.

The spelling of 81390022 in words is "eighty-one million, three hundred ninety thousand, twenty-two".