74691631 has 6 divisors (see below), whose sum is σ = 86886240. Its totient is φ = 64021356.

The previous prime is 74691619. The next prime is 74691647. The reversal of 74691631 is 13619647.

It is a de Polignac number, because none of the positive numbers 2^k-74691631 is a prime.

It is a super-2 number, since 2×74691631² = 11157679482880322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74691611) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 762111 + ... + 762208.

It is an arithmetic number, because the mean of its divisors is an integer number (14481040).

Almost surely, 2^74691631 is an apocalyptic number.

74691631 is a deficient number, since it is larger than the sum of its proper divisors (12194609).

74691631 is a wasteful number, since it uses less digits than its factorization.

74691631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1524333 (or 1524326 counting only the distinct ones).

The product of its digits is 27216, while the sum is 37.

The square root of 74691631 is about 8642.4320072535. The cubic root of 74691631 is about 421.1375642891.

The spelling of 74691631 in words is "seventy-four million, six hundred ninety-one thousand, six hundred thirty-one".