64140569 has 4 divisors (see below), whose sum is σ = 64156596. Its totient is φ = 64124544.

The previous prime is 64140539. The next prime is 64140631. The reversal of 64140569 is 96504146.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 58905625 + 5234944 = 7675^2 + 2288^2 .

It is a cyclic number.

It is not a de Polignac number, because 64140569 - 2¹² = 64136473 is a prime.

It is a super-2 number, since 2×64140569² = 8228025183287522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64140539) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3617 + ... + 11889.

It is an arithmetic number, because the mean of its divisors is an integer number (16039149).

Almost surely, 2^64140569 is an apocalyptic number.

It is an amenable number.

64140569 is a deficient number, since it is larger than the sum of its proper divisors (16027).

64140569 is an equidigital number, since it uses as much as digits as its factorization.

64140569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16026.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 64140569 is about 8008.7807436588. The cubic root of 64140569 is about 400.2926379387.

The spelling of 64140569 in words is "sixty-four million, one hundred forty thousand, five hundred sixty-nine".