64201520 has 40 divisors (see below), whose sum is σ = 158052384. Its totient is φ = 24169472.

The previous prime is 64201517. The next prime is 64201523. The reversal of 64201520 is 2510246.

It is a happy number.

64201520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (64201517) and next prime (64201523).

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 64201492 and 64201501.

It is not an unprimeable number, because it can be changed into a prime (64201523) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22244 + ... + 24963.

Almost surely, 2^64201520 is an apocalyptic number.

It is an amenable number.

64201520 is an abundant number, since it is smaller than the sum of its proper divisors (93850864).

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

64201520 is a wasteful number, since it uses less digits than its factorization.

64201520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47237 (or 47231 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 64201520 is about 8012.5851009521. The cubic root of 64201520 is about 400.4193934525.

Adding to 64201520 its reverse (2510246), we get a palindrome (66711766).

The spelling of 64201520 in words is "sixty-four million, two hundred one thousand, five hundred twenty".