81237804 has 12 divisors (see below), whose sum is σ = 189554904. Its totient is φ = 27079264.

The previous prime is 81237803. The next prime is 81237811. The reversal of 81237804 is 40873218.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (81237803) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3384897 + ... + 3384920.

It is an arithmetic number, because the mean of its divisors is an integer number (15796242).

Almost surely, 2^81237804 is an apocalyptic number.

It is an amenable number.

81237804 is an abundant number, since it is smaller than the sum of its proper divisors (108317100).

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

81237804 is a wasteful number, since it uses less digits than its factorization.

81237804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6769824 (or 6769822 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 81237804 is about 9013.2016509118. The cubic root of 81237804 is about 433.0978805048.

The spelling of 81237804 in words is "eighty-one million, two hundred thirty-seven thousand, eight hundred four".