74065991 has 4 divisors (see below), whose sum is σ = 78422832. Its totient is φ = 69709152.

The previous prime is 74065987. The next prime is 74065997. The reversal of 74065991 is 19956047.

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 74065991 - 2² = 74065987 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 (74065997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2178395 + ... + 2178428.

It is an arithmetic number, because the mean of its divisors is an integer number (19605708).

Almost surely, 2^74065991 is an apocalyptic number.

74065991 is a deficient number, since it is larger than the sum of its proper divisors (4356841).

74065991 is a wasteful number, since it uses less digits than its factorization.

74065991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4356840.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 74065991 is about 8606.1600612584. The cubic root of 74065991 is about 419.9584066898.

The spelling of 74065991 in words is "seventy-four million, sixty-five thousand, nine hundred ninety-one".