64740320 has 48 divisors (see below), whose sum is σ = 153679680. Its totient is φ = 25772544.

The previous prime is 64740317. The next prime is 64740329. The reversal of 64740320 is 2304746.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 64740320.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64740329) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37394 + ... + 39086.

It is an arithmetic number, because the mean of its divisors is an integer number (3201660).

Almost surely, 2^64740320 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 64740320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76839840).

64740320 is an abundant number, since it is smaller than the sum of its proper divisors (88939360).

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

64740320 is a wasteful number, since it uses less digits than its factorization.

64740320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1947 (or 1939 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 26.

The square root of 64740320 is about 8046.1369613001. The cubic root of 64740320 is about 401.5364242784.

The spelling of 64740320 in words is "sixty-four million, seven hundred forty thousand, three hundred twenty".