81416244 has 72 divisors (see below), whose sum is σ = 238008288. Its totient is φ = 21470400.

The previous prime is 81416239. The next prime is 81416299. The reversal of 81416244 is 44261418.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2319 + ... + 12969.

Almost surely, 2^81416244 is an apocalyptic number.

81416244 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81416244, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119004144).

81416244 is an abundant number, since it is smaller than the sum of its proper divisors (156592044).

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

81416244 is a wasteful number, since it uses less digits than its factorization.

81416244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10685 (or 10676 counting only the distinct ones).

The product of its digits is 6144, while the sum is 30.

The square root of 81416244 is about 9023.0950344103. The cubic root of 81416244 is about 433.4147505139.

The spelling of 81416244 in words is "eighty-one million, four hundred sixteen thousand, two hundred forty-four".