74564391 has 8 divisors (see below), whose sum is σ = 108457344. Its totient is φ = 45190520.

The previous prime is 74564359. The next prime is 74564429. The reversal of 74564391 is 19346547.

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 74564391 - 2⁵ = 74564359 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74564351) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1129731 + ... + 1129796.

It is an arithmetic number, because the mean of its divisors is an integer number (13557168).

Almost surely, 2^74564391 is an apocalyptic number.

74564391 is a deficient number, since it is larger than the sum of its proper divisors (33892953).

74564391 is a wasteful number, since it uses less digits than its factorization.

74564391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2259541.

The product of its digits is 90720, while the sum is 39.

The square root of 74564391 is about 8635.0675156596. The cubic root of 74564391 is about 420.8982871433.

It can be divided in two parts, 74 and 564391, that added together give a palindrome (564465).

The spelling of 74564391 in words is "seventy-four million, five hundred sixty-four thousand, three hundred ninety-one".