74322640 has 160 divisors (see below), whose sum is σ = 215771904. Its totient is φ = 23224320.

The previous prime is 74322629. The next prime is 74322643. The reversal of 74322640 is 4622347.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 74322599 and 74322608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (74322643) 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 31 ways as a sum of consecutive naturals, for example, 352135 + ... + 352345.

Almost surely, 2^74322640 is an apocalyptic number.

74322640 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 74322640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107885952).

74322640 is an abundant number, since it is smaller than the sum of its proper divisors (141449264).

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

74322640 is a wasteful number, since it uses less digits than its factorization.

74322640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285 (or 279 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 28.

The square root of 74322640 is about 8621.0579397195. The cubic root of 74322640 is about 420.4429189905.

Adding to 74322640 its reverse (4622347), we get a palindrome (78944987).

The spelling of 74322640 in words is "seventy-four million, three hundred twenty-two thousand, six hundred forty".