81183708 has 60 divisors (see below), whose sum is σ = 213152632. Its totient is φ = 26943840.

The previous prime is 81183689. The next prime is 81183709. The reversal of 81183708 is 80738118.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81183709) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 106866 + ... + 107622.

Almost surely, 2^81183708 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81183708, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106576316).

81183708 is an abundant number, since it is smaller than the sum of its proper divisors (131968924).

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

81183708 is a wasteful number, since it uses less digits than its factorization.

81183708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104 (or 1093 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 36.

The square root of 81183708 is about 9010.2002197509. The cubic root of 81183708 is about 433.0017263166.

The spelling of 81183708 in words is "eighty-one million, one hundred eighty-three thousand, seven hundred eight".