64161520 has 20 divisors (see below), whose sum is σ = 149175720. Its totient is φ = 25664576.

The previous prime is 64161479. The next prime is 64161529. The reversal of 64161520 is 2516146.

64161520 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64161529) 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 3 ways as a sum of consecutive naturals, for example, 400930 + ... + 401089.

It is an arithmetic number, because the mean of its divisors is an integer number (7458786).

Almost surely, 2^64161520 is an apocalyptic number.

It is an amenable number.

64161520 is an abundant number, since it is smaller than the sum of its proper divisors (85014200).

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

64161520 is a wasteful number, since it uses less digits than its factorization.

64161520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802032 (or 802026 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 64161520 is about 8010.0886387106. The cubic root of 64161520 is about 400.3362173156.

Adding to 64161520 its reverse (2516146), we get a palindrome (66677666).

The spelling of 64161520 in words is "sixty-four million, one hundred sixty-one thousand, five hundred twenty".