64519520 has 48 divisors (see below), whose sum is σ = 164157840. Its totient is φ = 23821824.

The previous prime is 64519489. The next prime is 64519523. The reversal of 64519520 is 2591546.

It is a happy number.

It is a super-2 number, since 2×64519520² = 8325536922060800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64519523) 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, 13430 + ... + 17589.

It is an arithmetic number, because the mean of its divisors is an integer number (3419955).

Almost surely, 2^64519520 is an apocalyptic number.

It is an amenable number.

64519520 is an abundant number, since it is smaller than the sum of its proper divisors (99638320).

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

64519520 is a wasteful number, since it uses less digits than its factorization.

64519520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31047 (or 31039 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 64519520 is about 8032.4043722910. The cubic root of 64519520 is about 401.0794178559.

The spelling of 64519520 in words is "sixty-four million, five hundred nineteen thousand, five hundred twenty".