74306639 has 4 divisors (see below), whose sum is σ = 81061800. Its totient is φ = 67551480.

The previous prime is 74306633. The next prime is 74306641. The reversal of 74306639 is 93660347.

It is a happy number.

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 74306639 - 2⁸ = 74306383 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 (74306633) 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, 3377564 + ... + 3377585.

It is an arithmetic number, because the mean of its divisors is an integer number (20265450).

Almost surely, 2^74306639 is an apocalyptic number.

74306639 is a deficient number, since it is larger than the sum of its proper divisors (6755161).

74306639 is a wasteful number, since it uses less digits than its factorization.

74306639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6755160.

The product of its (nonzero) digits is 81648, while the sum is 38.

The square root of 74306639 is about 8620.1298714115. The cubic root of 74306639 is about 420.4127442910.

The spelling of 74306639 in words is "seventy-four million, three hundred six thousand, six hundred thirty-nine".