74645631 has 20 divisors (see below), whose sum is σ = 111740112. Its totient is φ = 49660128.

The previous prime is 74645591. The next prime is 74645633. The reversal of 74645631 is 13654647.

It is a happy number.

74645631 is a `hidden beast` number, since 7 + 4 + 645 + 6 + 3 + 1 = 666.

It is not a de Polignac number, because 74645631 - 2⁶ = 74645567 is a prime.

It is a super-2 number, since 2×74645631² = 11143940454776322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74645633) by changing a digit.

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 in 19 ways as a sum of consecutive naturals, for example, 76710 + ... + 77676.

Almost surely, 2^74645631 is an apocalyptic number.

74645631 is a deficient number, since it is larger than the sum of its proper divisors (37094481).

74645631 is an equidigital number, since it uses as much as digits as its factorization.

74645631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932 (or 1923 counting only the distinct ones).

The product of its digits is 60480, while the sum is 36.

The square root of 74645631 is about 8639.7703094469. The cubic root of 74645631 is about 421.0510918335.

The spelling of 74645631 in words is "seventy-four million, six hundred forty-five thousand, six hundred thirty-one".