81088222 has 4 divisors (see below), whose sum is σ = 121632336. Its totient is φ = 40544110.

The previous prime is 81088211. The next prime is 81088279. The reversal of 81088222 is 22288018.

It is a semiprime because it is the product of two primes.

It is a super-3 number, since 3×81088222³ (a number of 25 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20272054 + ... + 20272057.

It is an arithmetic number, because the mean of its divisors is an integer number (30408084).

Almost surely, 2^81088222 is an apocalyptic number.

81088222 is a deficient number, since it is larger than the sum of its proper divisors (40544114).

81088222 is a wasteful number, since it uses less digits than its factorization.

81088222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40544113.

The product of its (nonzero) digits is 4096, while the sum is 31.

The square root of 81088222 is about 9004.8998883941. The cubic root of 81088222 is about 432.8318982222.

The spelling of 81088222 in words is "eighty-one million, eighty-eight thousand, two hundred twenty-two".