64652569 has 4 divisors (see below), whose sum is σ = 64723840. Its totient is φ = 64581300.

The previous prime is 64652557. The next prime is 64652593. The reversal of 64652569 is 96525646.

64652569 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64652569 is a prime.

It is a super-2 number, since 2×64652569² = 8359909356599522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64652869) 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, 34257 + ... + 36094.

It is an arithmetic number, because the mean of its divisors is an integer number (16180960).

Almost surely, 2^64652569 is an apocalyptic number.

It is an amenable number.

64652569 is a deficient number, since it is larger than the sum of its proper divisors (71271).

64652569 is an equidigital number, since it uses as much as digits as its factorization.

64652569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71270.

The product of its digits is 388800, while the sum is 43.

The square root of 64652569 is about 8040.6821228053. The cubic root of 64652569 is about 401.3549240202.

The spelling of 64652569 in words is "sixty-four million, six hundred fifty-two thousand, five hundred sixty-nine".