74381632 has 84 divisors (see below), whose sum is σ = 167149780. Its totient is φ = 32837376.

The previous prime is 74381611. The next prime is 74381639. The reversal of 74381632 is 23618347.

It is a happy number.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 2742336 + 71639296 = 1656^2 + 8464^2 .

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74381639) 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 11 ways as a sum of consecutive naturals, for example, 3233973 + ... + 3233995.

Almost surely, 2^74381632 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74381632, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83574890).

74381632 is an abundant number, since it is smaller than the sum of its proper divisors (92768148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

74381632 is an equidigital number, since it uses as much as digits as its factorization.

74381632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97 (or 38 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 74381632 is about 8624.4786509099. The cubic root of 74381632 is about 420.5541287527.

Adding to 74381632 its reverse (23618347), we get a palindrome (97999979).

The spelling of 74381632 in words is "seventy-four million, three hundred eighty-one thousand, six hundred thirty-two".