74344639 has 4 divisors (see below), whose sum is σ = 74372256. Its totient is φ = 74317024.

The previous prime is 74344591. The next prime is 74344643. The reversal of 74344639 is 93644347.

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 74344639 - 2¹³ = 74336447 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 (74344939) 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, 9274 + ... + 15319.

It is an arithmetic number, because the mean of its divisors is an integer number (18593064).

Almost surely, 2^74344639 is an apocalyptic number.

74344639 is a deficient number, since it is larger than the sum of its proper divisors (27617).

74344639 is a wasteful number, since it uses less digits than its factorization.

74344639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27616.

The product of its digits is 217728, while the sum is 40.

The square root of 74344639 is about 8622.3337328127. Note that the first 3 decimals coincide. The cubic root of 74344639 is about 420.4843976541.

The spelling of 74344639 in words is "seventy-four million, three hundred forty-four thousand, six hundred thirty-nine".