64785565 has 16 divisors (see below), whose sum is σ = 86612400. Its totient is φ = 46190592.

The previous prime is 64785551. The next prime is 64785569. The reversal of 64785565 is 56558746.

It can be written as a sum of positive squares in 8 ways, for example, as 352836 + 64432729 = 594^2 + 8027^2 .

It is a cyclic number.

It is not a de Polignac number, because 64785565 - 2⁷ = 64785437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64785569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15300 + ... + 19069.

It is an arithmetic number, because the mean of its divisors is an integer number (5413275).

Almost surely, 2^64785565 is an apocalyptic number.

64785565 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

64785565 is a deficient number, since it is larger than the sum of its proper divisors (21826835).

64785565 is a wasteful number, since it uses less digits than its factorization.

64785565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34416.

The product of its digits is 1008000, while the sum is 46.

The square root of 64785565 is about 8048.9480679155. The cubic root of 64785565 is about 401.6299429436.

The spelling of 64785565 in words is "sixty-four million, seven hundred eighty-five thousand, five hundred sixty-five".