64536720 has 80 divisors (see below), whose sum is σ = 201981120. Its totient is φ = 17044992.

The previous prime is 64536713. The next prime is 64536739. The reversal of 64536720 is 2763546.

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

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24927 + ... + 27393.

It is an arithmetic number, because the mean of its divisors is an integer number (2524764).

Almost surely, 2^64536720 is an apocalyptic number.

64536720 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 64536720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100990560).

64536720 is an abundant number, since it is smaller than the sum of its proper divisors (137444400).

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

64536720 is a wasteful number, since it uses less digits than its factorization.

64536720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2592 (or 2586 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 33.

The square root of 64536720 is about 8033.4749641733. The cubic root of 64536720 is about 401.1150554069.

It can be divided in two parts, 64536 and 720, that added together give a palindrome (65256).

The spelling of 64536720 in words is "sixty-four million, five hundred thirty-six thousand, seven hundred twenty".