64260520 has 64 divisors (see below), whose sum is σ = 154483200. Its totient is φ = 24003840.

The previous prime is 64260503. The next prime is 64260523. The reversal of 64260520 is 2506246.

It is not an unprimeable number, because it can be changed into a prime (64260523) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35067 + ... + 36853.

It is an arithmetic number, because the mean of its divisors is an integer number (2413800).

Almost surely, 2^64260520 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 64260520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77241600).

64260520 is an abundant number, since it is smaller than the sum of its proper divisors (90222680).

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

64260520 is a wasteful number, since it uses less digits than its factorization.

64260520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1858 (or 1854 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 64260520 is about 8016.2659636517. The cubic root of 64260520 is about 400.5420152170.

Adding to 64260520 its reverse (2506246), we get a palindrome (66766766).

The spelling of 64260520 in words is "sixty-four million, two hundred sixty thousand, five hundred twenty".