73919991 has 8 divisors (see below), whose sum is σ = 98634240. Its totient is φ = 49242872.

The previous prime is 73919941. The next prime is 73920023. The reversal of 73919991 is 19991937.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 73919991 - 2⁷ = 73919863 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 73919991.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73919941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4245 + ... + 12878.

It is an arithmetic number, because the mean of its divisors is an integer number (12329280).

Almost surely, 2^73919991 is an apocalyptic number.

73919991 is a deficient number, since it is larger than the sum of its proper divisors (24714249).

73919991 is a wasteful number, since it uses less digits than its factorization.

73919991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18565.

The product of its digits is 137781, while the sum is 48.

The square root of 73919991 is about 8597.6735806845. The cubic root of 73919991 is about 419.6822823923.

The spelling of 73919991 in words is "seventy-three million, nine hundred nineteen thousand, nine hundred ninety-one".