74639140 has 48 divisors (see below), whose sum is σ = 164545920. Its totient is φ = 28385280.

The previous prime is 74639111. The next prime is 74639143. The reversal of 74639140 is 4193647.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 74639096 and 74639105.

It is not an unprimeable number, because it can be changed into a prime (74639143) 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 15 ways as a sum of consecutive naturals, for example, 96676 + ... + 97444.

It is an arithmetic number, because the mean of its divisors is an integer number (3428040).

Almost surely, 2^74639140 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 74639140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82272960).

74639140 is an abundant number, since it is smaller than the sum of its proper divisors (89906780).

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

74639140 is a wasteful number, since it uses less digits than its factorization.

74639140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1012 (or 1010 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 74639140 is about 8639.3946547197. The cubic root of 74639140 is about 421.0388869581.

The spelling of 74639140 in words is "seventy-four million, six hundred thirty-nine thousand, one hundred forty".