74128685 has 4 divisors (see below), whose sum is σ = 88954428. Its totient is φ = 59302944.

The previous prime is 74128679. The next prime is 74128693. The reversal of 74128685 is 58682147.

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 43414921 + 30713764 = 6589^2 + 5542^2 .

It is a cyclic number.

It is not a de Polignac number, because 74128685 - 2¹⁶ = 74063149 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7412864 + ... + 7412873.

It is an arithmetic number, because the mean of its divisors is an integer number (22238607).

Almost surely, 2^74128685 is an apocalyptic number.

It is an amenable number.

74128685 is a deficient number, since it is larger than the sum of its proper divisors (14825743).

74128685 is a wasteful number, since it uses less digits than its factorization.

74128685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14825742.

The product of its digits is 107520, while the sum is 41.

The square root of 74128685 is about 8609.8016818043. The cubic root of 74128685 is about 420.0768661280.

The spelling of 74128685 in words is "seventy-four million, one hundred twenty-eight thousand, six hundred eighty-five".