74216643 has 4 divisors (see below), whose sum is σ = 98955528. Its totient is φ = 49477760.

The previous prime is 74216627. The next prime is 74216647. The reversal of 74216643 is 34661247.

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 74216643 - 2⁴ = 74216627 is a prime.

It is a super-2 number, since 2×74216643² = 11016220196378898, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (74216647) 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 3 ways as a sum of consecutive naturals, for example, 12369438 + ... + 12369443.

It is an arithmetic number, because the mean of its divisors is an integer number (24738882).

Almost surely, 2^74216643 is an apocalyptic number.

74216643 is a deficient number, since it is larger than the sum of its proper divisors (24738885).

74216643 is a wasteful number, since it uses less digits than its factorization.

74216643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24738884.

The product of its digits is 24192, while the sum is 33.

The square root of 74216643 is about 8614.9081829118. The cubic root of 74216643 is about 420.2429490082.

The spelling of 74216643 in words is "seventy-four million, two hundred sixteen thousand, six hundred forty-three".