64130520 has 64 divisors (see below), whose sum is σ = 195567840. Its totient is φ = 16819200.

The previous prime is 64130497. The next prime is 64130533. The reversal of 64130520 is 2503146.

It is a happy number.

64130520 is nontrivially palindromic in base 11.

It is a super-2 number, since 2×64130520² = 8225447190940800, which contains 22 as substring.

It is a zygodrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2940 + ... + 11700.

Almost surely, 2^64130520 is an apocalyptic number.

64130520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64130520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97783920).

64130520 is an abundant number, since it is smaller than the sum of its proper divisors (131437320).

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

64130520 is a wasteful number, since it uses less digits than its factorization.

64130520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8836 (or 8832 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 64130520 is about 8008.1533451851. The cubic root of 64130520 is about 400.2717320291.

Adding to 64130520 its reverse (2503146), we get a palindrome (66633666).

The spelling of 64130520 in words is "sixty-four million, one hundred thirty thousand, five hundred twenty".