74688644 has 24 divisors (see below), whose sum is σ = 136454808. Its totient is φ = 35735040.

The previous prime is 74688643. The next prime is 74688683. The reversal of 74688644 is 44688647.

It can be written as a sum of positive squares in 4 ways, for example, as 14440000 + 60248644 = 3800^2 + 7762^2 .

It is not an unprimeable number, because it can be changed into a prime (74688643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4892 + ... + 13164.

It is an arithmetic number, because the mean of its divisors is an integer number (5685617).

Almost surely, 2^74688644 is an apocalyptic number.

74688644 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

It is an amenable number.

74688644 is a deficient number, since it is larger than the sum of its proper divisors (61766164).

74688644 is a wasteful number, since it uses less digits than its factorization.

74688644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8375 (or 8373 counting only the distinct ones).

The product of its digits is 1032192, while the sum is 47.

The square root of 74688644 is about 8642.2591953725. The cubic root of 74688644 is about 421.1319502970.

The spelling of 74688644 in words is "seventy-four million, six hundred eighty-eight thousand, six hundred forty-four".