74321639 has 8 divisors (see below), whose sum is σ = 85090848. Its totient is φ = 63590400.

The previous prime is 74321633. The next prime is 74321657. The reversal of 74321639 is 93612347.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74321639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 74321599 and 74321608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74321633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5162 + ... + 13239.

It is an arithmetic number, because the mean of its divisors is an integer number (10636356).

Almost surely, 2^74321639 is an apocalyptic number.

74321639 is a deficient number, since it is larger than the sum of its proper divisors (10769209).

74321639 is a wasteful number, since it uses less digits than its factorization.

74321639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18985.

The product of its digits is 27216, while the sum is 35.

The square root of 74321639 is about 8620.9998840042. Note that the first 3 decimals coincide. The cubic root of 74321639 is about 420.4410314309.

The spelling of 74321639 in words is "seventy-four million, three hundred twenty-one thousand, six hundred thirty-nine".