74138687 has 8 divisors (see below), whose sum is σ = 84878976. Its totient is φ = 63435672.

The previous prime is 74138681. The next prime is 74138689. The reversal of 74138687 is 78683147.

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 74138687 - 2¹⁶ = 74073151 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74138681) 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, 4913 + ... + 13130.

It is an arithmetic number, because the mean of its divisors is an integer number (10609872).

Almost surely, 2^74138687 is an apocalyptic number.

74138687 is a deficient number, since it is larger than the sum of its proper divisors (10740289).

74138687 is a wasteful number, since it uses less digits than its factorization.

74138687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18637.

The product of its digits is 225792, while the sum is 44.

The square root of 74138687 is about 8610.3825118284. The cubic root of 74138687 is about 420.0957585890.

The spelling of 74138687 in words is "seventy-four million, one hundred thirty-eight thousand, six hundred eighty-seven".