64513280 has 72 divisors (see below), whose sum is σ = 166459272. Its totient is φ = 23814144.

The previous prime is 64513279. The next prime is 64513289. The reversal of 64513280 is 8231546.

It can be written as a sum of positive squares in 4 ways, for example, as 256 + 64513024 = 16^2 + 8032^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64513289) 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, 14702 + ... + 18578.

Almost surely, 2^64513280 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 64513280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83229636).

64513280 is an abundant number, since it is smaller than the sum of its proper divisors (101945992).

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

64513280 is a wasteful number, since it uses less digits than its factorization.

64513280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3911 (or 3897 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 64513280 is about 8032.0159362392. The cubic root of 64513280 is about 401.0664873182.

The spelling of 64513280 in words is "sixty-four million, five hundred thirteen thousand, two hundred eighty".