81844282 has 16 divisors (see below), whose sum is σ = 135436392. Its totient is φ = 36852480.

The previous prime is 81844277. The next prime is 81844291. The reversal of 81844282 is 28244818.

It can be written as a sum of positive squares in 4 ways, for example, as 18498601 + 63345681 = 4301^2 + 7959^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37323 + ... + 39454.

Almost surely, 2^81844282 is an apocalyptic number.

81844282 is a gapful number since it is divisible by the number (82) formed by its first and last digit.

81844282 is a deficient number, since it is larger than the sum of its proper divisors (53592110).

81844282 is a wasteful number, since it uses less digits than its factorization.

81844282 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76833.

The product of its digits is 32768, while the sum is 37.

The square root of 81844282 is about 9046.7829641260. The cubic root of 81844282 is about 434.1729686363.

The spelling of 81844282 in words is "eighty-one million, eight hundred forty-four thousand, two hundred eighty-two".