64519280 has 120 divisors (see below), whose sum is σ = 177265440. Its totient is φ = 21772800.

The previous prime is 64519253. The next prime is 64519283. The reversal of 64519280 is 8291546.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 64519280.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64519283) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 427205 + ... + 427355.

It is an arithmetic number, because the mean of its divisors is an integer number (1477212).

Almost surely, 2^64519280 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 64519280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88632720).

64519280 is an abundant number, since it is smaller than the sum of its proper divisors (112746160).

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

64519280 is a wasteful number, since it uses less digits than its factorization.

64519280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287 (or 274 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 64519280 is about 8032.3894327902. The cubic root of 64519280 is about 401.0789205429.

The spelling of 64519280 in words is "sixty-four million, five hundred nineteen thousand, two hundred eighty".