81392226 has 48 divisors (see below), whose sum is σ = 175564704. Its totient is φ = 25145856.

The previous prime is 81392221. The next prime is 81392251. The reversal of 81392226 is 62229318.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (81392221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 126261 + ... + 126903.

It is an arithmetic number, because the mean of its divisors is an integer number (3657598).

Almost surely, 2^81392226 is an apocalyptic number.

81392226 is an abundant number, since it is smaller than the sum of its proper divisors (94172478).

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

81392226 is a wasteful number, since it uses less digits than its factorization.

81392226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755 (or 738 counting only the distinct ones).

The product of its digits is 10368, while the sum is 33.

The square root of 81392226 is about 9021.7640181951. The cubic root of 81392226 is about 433.3721268360.

It can be divided in two parts, 81392 and 226, that added together give a palindrome (81618).

The spelling of 81392226 in words is "eighty-one million, three hundred ninety-two thousand, two hundred twenty-six".