64447680 has 224 divisors, whose sum is σ = 237012480. Its totient is φ = 14663680.

The previous prime is 64447661. The next prime is 64447681. The reversal of 64447680 is 8674446.

64447680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64447681) 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 31 ways as a sum of consecutive naturals, for example, 179341 + ... + 179699.

Almost surely, 2^64447680 is an apocalyptic number.

64447680 is a gapful number since it is divisible by the number (60) 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 64447680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118506240).

64447680 is an abundant number, since it is smaller than the sum of its proper divisors (172564800).

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

64447680 is a wasteful number, since it uses less digits than its factorization.

64447680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407 (or 397 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 39.

The square root of 64447680 is about 8027.9312403632. The cubic root of 64447680 is about 400.9305004107.

It can be divided in two parts, 64 and 447680, that added together give a palindrome (447744).

The spelling of 64447680 in words is "sixty-four million, four hundred forty-seven thousand, six hundred eighty".