73444991 has 4 divisors (see below), whose sum is σ = 73749984. Its totient is φ = 73140000.

The previous prime is 73444967. The next prime is 73444993. The reversal of 73444991 is 19944437.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19944437 = 241 ⋅82757.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-73444991 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 (73444993) 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, 152135 + ... + 152616.

It is an arithmetic number, because the mean of its divisors is an integer number (18437496).

Almost surely, 2^73444991 is an apocalyptic number.

73444991 is a deficient number, since it is larger than the sum of its proper divisors (304993).

73444991 is a wasteful number, since it uses less digits than its factorization.

73444991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304992.

The product of its digits is 108864, while the sum is 41.

The square root of 73444991 is about 8570.0053092166. The cubic root of 73444991 is about 418.7814092130.

The spelling of 73444991 in words is "seventy-three million, four hundred forty-four thousand, nine hundred ninety-one".