73985813 has 6 divisors (see below), whose sum is σ = 81323382. Its totient is φ = 67259720.

The previous prime is 73985803. The next prime is 73985831. The reversal of 73985813 is 31858937.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 72301009 + 1684804 = 8503^2 + 1298^2 .

It is not a de Polignac number, because 73985813 - 2⁶ = 73985749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73985803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 305606 + ... + 305847.

It is an arithmetic number, because the mean of its divisors is an integer number (13553897).

Almost surely, 2^73985813 is an apocalyptic number.

It is an amenable number.

73985813 is a deficient number, since it is larger than the sum of its proper divisors (7337569).

73985813 is a wasteful number, since it uses less digits than its factorization.

73985813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 611475 (or 611464 counting only the distinct ones).

The product of its digits is 181440, while the sum is 44.

The square root of 73985813 is about 8601.5006248910. The cubic root of 73985813 is about 419.8068140268.

The spelling of 73985813 in words is "seventy-three million, nine hundred eighty-five thousand, eight hundred thirteen".