81233616 has 40 divisors (see below), whose sum is σ = 222200064. Its totient is φ = 25484800.

The previous prime is 81233563. The next prime is 81233617. The reversal of 81233616 is 61633218.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81233617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48960 + ... + 50591.

Almost surely, 2^81233616 is an apocalyptic number.

It is an amenable number.

81233616 is an abundant number, since it is smaller than the sum of its proper divisors (140966448).

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

81233616 is a wasteful number, since it uses less digits than its factorization.

81233616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99579 (or 99573 counting only the distinct ones).

The product of its digits is 5184, while the sum is 30.

The square root of 81233616 is about 9012.9693220381. The cubic root of 81233616 is about 433.0904379718.

The spelling of 81233616 in words is "eighty-one million, two hundred thirty-three thousand, six hundred sixteen".