73645999 has 4 divisors (see below), whose sum is σ = 84166864. Its totient is φ = 63125136.

The previous prime is 73645981. The next prime is 73646009. The reversal of 73645999 is 99954637.

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

It is a cyclic number.

It is not a de Polignac number, because 73645999 - 2⁹ = 73645487 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 (73645969) 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, 5260422 + ... + 5260435.

It is an arithmetic number, because the mean of its divisors is an integer number (21041716).

Almost surely, 2^73645999 is an apocalyptic number.

73645999 is a deficient number, since it is larger than the sum of its proper divisors (10520865).

73645999 is a wasteful number, since it uses less digits than its factorization.

73645999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10520864.

The product of its digits is 1837080, while the sum is 52.

The square root of 73645999 is about 8581.7247101034. The cubic root of 73645999 is about 419.1631086515.

The spelling of 73645999 in words is "seventy-three million, six hundred forty-five thousand, nine hundred ninety-nine".