73668913 has 4 divisors (see below), whose sum is σ = 73853028. Its totient is φ = 73484800.

The previous prime is 73668893. The next prime is 73668919. The reversal of 73668913 is 31986637.

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

It can be written as a sum of positive squares in 2 ways, for example, as 72880369 + 788544 = 8537^2 + 888^2 .

It is a cyclic number.

It is not a de Polignac number, because 73668913 - 2⁹ = 73668401 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 73668913.

It is not an unprimeable number, because it can be changed into a prime (73668919) 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, 91456 + ... + 92257.

It is an arithmetic number, because the mean of its divisors is an integer number (18463257).

Almost surely, 2^73668913 is an apocalyptic number.

It is an amenable number.

73668913 is a deficient number, since it is larger than the sum of its proper divisors (184115).

73668913 is a wasteful number, since it uses less digits than its factorization.

73668913 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184114.

The product of its digits is 163296, while the sum is 43.

The square root of 73668913 is about 8583.0596525948. The cubic root of 73668913 is about 419.2065765368.

The spelling of 73668913 in words is "seventy-three million, six hundred sixty-eight thousand, nine hundred thirteen".