73799781 has 16 divisors (see below), whose sum is σ = 112995840. Its totient is φ = 42372720.

The previous prime is 73799777. The next prime is 73799783. The reversal of 73799781 is 18799737.

It is a happy number.

It is not a de Polignac number, because 73799781 - 2² = 73799777 is a prime.

It is a super-2 number, since 2×73799781² = 10892815351295922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73799783) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 58225 + ... + 59478.

It is an arithmetic number, because the mean of its divisors is an integer number (7062240).

Almost surely, 2^73799781 is an apocalyptic number.

It is an amenable number.

73799781 is a deficient number, since it is larger than the sum of its proper divisors (39196059).

73799781 is a wasteful number, since it uses less digits than its factorization.

73799781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117736.

The product of its digits is 666792, while the sum is 51.

The square root of 73799781 is about 8590.6798916035. The cubic root of 73799781 is about 419.4546607040.

The spelling of 73799781 in words is "seventy-three million, seven hundred ninety-nine thousand, seven hundred eighty-one".