74128493 has 4 divisors (see below), whose sum is σ = 74180028. Its totient is φ = 74076960.

The previous prime is 74128489. The next prime is 74128499. The reversal of 74128493 is 39482147.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 56505289 + 17623204 = 7517^2 + 4198^2 .

It is a cyclic number.

It is not a de Polignac number, because 74128493 - 2² = 74128489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74128499) 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, 23546 + ... + 26507.

It is an arithmetic number, because the mean of its divisors is an integer number (18545007).

Almost surely, 2^74128493 is an apocalyptic number.

It is an amenable number.

74128493 is a deficient number, since it is larger than the sum of its proper divisors (51535).

74128493 is a wasteful number, since it uses less digits than its factorization.

74128493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51534.

The product of its digits is 48384, while the sum is 38.

The square root of 74128493 is about 8609.7905317145. The cubic root of 74128493 is about 420.0765034487.

The spelling of 74128493 in words is "seventy-four million, one hundred twenty-eight thousand, four hundred ninety-three".