73991811 has 4 divisors (see below), whose sum is σ = 98655752. Its totient is φ = 49327872.

The previous prime is 73991809. The next prime is 73991831. The reversal of 73991811 is 11819937.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 73991811 - 2¹ = 73991809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 73991811.

It is not an unprimeable number, because it can be changed into a prime (73991831) 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, 12331966 + ... + 12331971.

It is an arithmetic number, because the mean of its divisors is an integer number (24663938).

Almost surely, 2^73991811 is an apocalyptic number.

73991811 is a deficient number, since it is larger than the sum of its proper divisors (24663941).

73991811 is a wasteful number, since it uses less digits than its factorization.

73991811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24663940.

The product of its digits is 13608, while the sum is 39.

The square root of 73991811 is about 8601.8492779169. The cubic root of 73991811 is about 419.8181582432.

The spelling of 73991811 in words is "seventy-three million, nine hundred ninety-one thousand, eight hundred eleven".