74257643 has 8 divisors (see below), whose sum is σ = 78495120. Its totient is φ = 70053120.

The previous prime is 74257637. The next prime is 74257657. The reversal of 74257643 is 34675247.

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 74257643 - 2¹⁰ = 74256619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 74257597 and 74257606.

It is not an unprimeable number, because it can be changed into a prime (74257633) 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, 3530 + ... + 12687.

It is an arithmetic number, because the mean of its divisors is an integer number (9811890).

Almost surely, 2^74257643 is an apocalyptic number.

74257643 is a deficient number, since it is larger than the sum of its proper divisors (4237477).

74257643 is a wasteful number, since it uses less digits than its factorization.

74257643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16477.

The product of its digits is 141120, while the sum is 38.

The square root of 74257643 is about 8617.2874502363. The cubic root of 74257643 is about 420.3203206433.

It can be divided in two parts, 742 and 57643, that added together give a palindrome (58385).

The spelling of 74257643 in words is "seventy-four million, two hundred fifty-seven thousand, six hundred forty-three".