64863520 has 48 divisors (see below), whose sum is σ = 156151800. Its totient is φ = 25452544.

The previous prime is 64863509. The next prime is 64863521. The reversal of 64863520 is 2536846.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 41938576 + 22924944 = 6476^2 + 4788^2 .

It is not an unprimeable number, because it can be changed into a prime (64863521) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4656 + ... + 12304.

Almost surely, 2^64863520 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 64863520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78075900).

64863520 is an abundant number, since it is smaller than the sum of its proper divisors (91288280).

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

64863520 is a wasteful number, since it uses less digits than its factorization.

64863520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7717 (or 7709 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 64863520 is about 8053.7891703223. The cubic root of 64863520 is about 401.7909691061.

The spelling of 64863520 in words is "sixty-four million, eight hundred sixty-three thousand, five hundred twenty".