81783226 has 16 divisors (see below), whose sum is σ = 148447296. Its totient is φ = 32988096.

The previous prime is 81783223. The next prime is 81783227. The reversal of 81783226 is 62238718.

It is not an unprimeable number, because it can be changed into a prime (81783223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171576 + ... + 172051.

It is an arithmetic number, because the mean of its divisors is an integer number (9277956).

Almost surely, 2^81783226 is an apocalyptic number.

81783226 is a deficient number, since it is larger than the sum of its proper divisors (66664070).

81783226 is a wasteful number, since it uses less digits than its factorization.

81783226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343653.

The product of its digits is 32256, while the sum is 37.

The square root of 81783226 is about 9043.4078753532. The cubic root of 81783226 is about 434.0649771402.

The spelling of 81783226 in words is "eighty-one million, seven hundred eighty-three thousand, two hundred twenty-six".