74120643 has 8 divisors (see below), whose sum is σ = 109808400. Its totient is φ = 49413744.

The previous prime is 74120633. The next prime is 74120671. The reversal of 74120643 is 34602147.

74120643 is a `hidden beast` number, since 7 + 4 + 12 + 0 + 643 = 666.

It is not a de Polignac number, because 74120643 - 2⁵ = 74120611 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 2745209 = 74120643 / (7 + 4 + 1 + 2 + 0 + 6 + 4 + 3).

It is not an unprimeable number, because it can be changed into a prime (74120603) 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, 1372578 + ... + 1372631.

It is an arithmetic number, because the mean of its divisors is an integer number (13726050).

Almost surely, 2^74120643 is an apocalyptic number.

74120643 is a deficient number, since it is larger than the sum of its proper divisors (35687757).

74120643 is a wasteful number, since it uses less digits than its factorization.

74120643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2745218 (or 2745212 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 27.

The square root of 74120643 is about 8609.3346432811. The cubic root of 74120643 is about 420.0616746165.

The spelling of 74120643 in words is "seventy-four million, one hundred twenty thousand, six hundred forty-three".