74136631 has 4 divisors (see below), whose sum is σ = 74720512. Its totient is φ = 73552752.

The previous prime is 74136607. The next prime is 74136691. The reversal of 74136631 is 13663147.

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

It is a cyclic number.

It is not a de Polignac number, because 74136631 - 2¹¹ = 74134583 is a prime.

It is a super-2 number, since 2×74136631² = 10992480112060322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 74136593 and 74136602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74136691) 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, 291750 + ... + 292003.

It is an arithmetic number, because the mean of its divisors is an integer number (18680128).

Almost surely, 2^74136631 is an apocalyptic number.

74136631 is a deficient number, since it is larger than the sum of its proper divisors (583881).

74136631 is a wasteful number, since it uses less digits than its factorization.

74136631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 583880.

The product of its digits is 9072, while the sum is 31.

The square root of 74136631 is about 8610.2631202536. The cubic root of 74136631 is about 420.0918752145.

Adding to 74136631 its reverse (13663147), we get a palindrome (87799778).

The spelling of 74136631 in words is "seventy-four million, one hundred thirty-six thousand, six hundred thirty-one".