81803799 has 24 divisors (see below), whose sum is σ = 147318912. Its totient is φ = 42495120.

The previous prime is 81803791. The next prime is 81803803. The reversal of 81803799 is 99730818.

It is not a de Polignac number, because 81803799 - 2³ = 81803791 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81803791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58329 + ... + 59714.

It is an arithmetic number, because the mean of its divisors is an integer number (6138288).

Almost surely, 2^81803799 is an apocalyptic number.

81803799 is a deficient number, since it is larger than the sum of its proper divisors (65515113).

81803799 is a wasteful number, since it uses less digits than its factorization.

81803799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118067 (or 118064 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 81803799 is about 9044.5452622009. The cubic root of 81803799 is about 434.1013711968.

The spelling of 81803799 in words is "eighty-one million, eight hundred three thousand, seven hundred ninety-nine".