74317631 has 4 divisors (see below), whose sum is σ = 76045992. Its totient is φ = 72589272.

The previous prime is 74317613. The next prime is 74317637. The reversal of 74317631 is 13671347.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-74317631 is a prime.

It is a super-4 number, since 4×74317631⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74317637) 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, 864116 + ... + 864201.

It is an arithmetic number, because the mean of its divisors is an integer number (19011498).

Almost surely, 2^74317631 is an apocalyptic number.

74317631 is a deficient number, since it is larger than the sum of its proper divisors (1728361).

74317631 is a wasteful number, since it uses less digits than its factorization.

74317631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1728360.

The product of its digits is 10584, while the sum is 32.

The square root of 74317631 is about 8620.7674252354. The cubic root of 74317631 is about 420.4334734798.

Adding to 74317631 its reverse (13671347), we get a palindrome (87988978).

The spelling of 74317631 in words is "seventy-four million, three hundred seventeen thousand, six hundred thirty-one".