81922306 has 8 divisors (see below), whose sum is σ = 123013440. Its totient is φ = 40917828.

The previous prime is 81922283. The next prime is 81922349. The reversal of 81922306 is 60322918.

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

It is a super-2 number, since 2×81922306² = 13422528440715272, which contains 22 as substring.

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, 19246 + ... + 23113.

It is an arithmetic number, because the mean of its divisors is an integer number (15376680).

Almost surely, 2^81922306 is an apocalyptic number.

81922306 is a deficient number, since it is larger than the sum of its proper divisors (41091134).

81922306 is a wasteful number, since it uses less digits than its factorization.

81922306 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43328.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 81922306 is about 9051.0941879974. The cubic root of 81922306 is about 434.3108937778.

It can be divided in two parts, 81922 and 306, that added together give a palindrome (82228).

The spelling of 81922306 in words is "eighty-one million, nine hundred twenty-two thousand, three hundred six".