74408638 has 4 divisors (see below), whose sum is σ = 111612960. Its totient is φ = 37204318.

The previous prime is 74408629. The next prime is 74408683. The reversal of 74408638 is 83680447.

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

It is a self number, because there is not a number n which added to its sum of digits gives 74408638.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18602158 + ... + 18602161.

It is an arithmetic number, because the mean of its divisors is an integer number (27903240).

Almost surely, 2^74408638 is an apocalyptic number.

74408638 is a deficient number, since it is larger than the sum of its proper divisors (37204322).

74408638 is a wasteful number, since it uses less digits than its factorization.

74408638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37204321.

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 74408638 is about 8626.0441686789. The cubic root of 74408638 is about 420.6050199483.

The spelling of 74408638 in words is "seventy-four million, four hundred eight thousand, six hundred thirty-eight".