64561769 has 4 divisors (see below), whose sum is σ = 64886400. Its totient is φ = 64237140.

The previous prime is 64561709. The next prime is 64561771. The reversal of 64561769 is 96716546.

It is a happy number.

64561769 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 not a de Polignac number, because 64561769 - 2¹⁶ = 64496233 is a prime.

It is a super-2 number, since 2×64561769² = 8336444032818722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64561709) 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, 162017 + ... + 162414.

It is an arithmetic number, because the mean of its divisors is an integer number (16221600).

Almost surely, 2^64561769 is an apocalyptic number.

It is an amenable number.

64561769 is a deficient number, since it is larger than the sum of its proper divisors (324631).

64561769 is a wasteful number, since it uses less digits than its factorization.

64561769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324630.

The product of its digits is 272160, while the sum is 44.

The square root of 64561769 is about 8035.0338518266. The cubic root of 64561769 is about 401.1669443748.

The spelling of 64561769 in words is "sixty-four million, five hundred sixty-one thousand, seven hundred sixty-nine".