74128438 has 4 divisors (see below), whose sum is σ = 111192660. Its totient is φ = 37064218.

The previous prime is 74128403. The next prime is 74128463. The reversal of 74128438 is 83482147.

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

It is a junction number, because it is equal to n+sod(n) for n = 74128397 and 74128406.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 18532108 + ... + 18532111.

It is an arithmetic number, because the mean of its divisors is an integer number (27798165).

Almost surely, 2^74128438 is an apocalyptic number.

74128438 is a deficient number, since it is larger than the sum of its proper divisors (37064222).

74128438 is a wasteful number, since it uses less digits than its factorization.

74128438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37064221.

The product of its digits is 43008, while the sum is 37.

The square root of 74128438 is about 8609.7873376757. The cubic root of 74128438 is about 420.0763995561.

The spelling of 74128438 in words is "seventy-four million, one hundred twenty-eight thousand, four hundred thirty-eight".