64884720 has 80 divisors (see below), whose sum is σ = 204977952. Its totient is φ = 16972800.

The previous prime is 64884709. The next prime is 64884727. The reversal of 64884720 is 2748846.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64884727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10170 + ... + 15270.

Almost surely, 2^64884720 is an apocalyptic number.

64884720 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 64884720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102488976).

64884720 is an abundant number, since it is smaller than the sum of its proper divisors (140093232).

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

64884720 is a wasteful number, since it uses less digits than its factorization.

64884720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5170 (or 5164 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 39.

The square root of 64884720 is about 8055.1052134656. The cubic root of 64884720 is about 401.8347381395.

The spelling of 64884720 in words is "sixty-four million, eight hundred eighty-four thousand, seven hundred twenty".