73391636 has 6 divisors (see below), whose sum is σ = 128435370. Its totient is φ = 36695816.

The previous prime is 73391627. The next prime is 73391639. The reversal of 73391636 is 63619337.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 67141636 + 6250000 = 8194^2 + 2500^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 73391636.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73391639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9173951 + ... + 9173958.

It is an arithmetic number, because the mean of its divisors is an integer number (21405895).

Almost surely, 2^73391636 is an apocalyptic number.

It is an amenable number.

73391636 is a deficient number, since it is larger than the sum of its proper divisors (55043734).

73391636 is a wasteful number, since it uses less digits than its factorization.

73391636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18347913 (or 18347911 counting only the distinct ones).

The product of its digits is 61236, while the sum is 38.

The square root of 73391636 is about 8566.8918517745. The cubic root of 73391636 is about 418.6799750436.

The spelling of 73391636 in words is "seventy-three million, three hundred ninety-one thousand, six hundred thirty-six".