64505785 has 4 divisors (see below), whose sum is σ = 77406948. Its totient is φ = 51604624.

The previous prime is 64505767. The next prime is 64505789. The reversal of 64505785 is 58750546.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13697401 + 50808384 = 3701^2 + 7128^2 .

It is a cyclic number.

It is not a de Polignac number, because 64505785 - 2¹³ = 64497593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64505789) 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, 6450574 + ... + 6450583.

It is an arithmetic number, because the mean of its divisors is an integer number (19351737).

Almost surely, 2^64505785 is an apocalyptic number.

It is an amenable number.

64505785 is a deficient number, since it is larger than the sum of its proper divisors (12901163).

64505785 is a wasteful number, since it uses less digits than its factorization.

64505785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12901162.

The product of its (nonzero) digits is 168000, while the sum is 40.

The square root of 64505785 is about 8031.5493523977. The cubic root of 64505785 is about 401.0509550653.

The spelling of 64505785 in words is "sixty-four million, five hundred five thousand, seven hundred eighty-five".