64200785 has 20 divisors (see below), whose sum is σ = 84841140. Its totient is φ = 46638240.

The previous prime is 64200781. The next prime is 64200817. The reversal of 64200785 is 58700246.

It can be written as a sum of positive squares in 2 ways, for example, as 39589264 + 24611521 = 6292^2 + 4961^2 .

It is not a de Polignac number, because 64200785 - 2² = 64200781 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64200781) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 72767 + ... + 73643.

It is an arithmetic number, because the mean of its divisors is an integer number (4242057).

Almost surely, 2^64200785 is an apocalyptic number.

It is an amenable number.

64200785 is a deficient number, since it is larger than the sum of its proper divisors (20640355).

64200785 is an frugal number, since it uses more digits than its factorization.

64200785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 926 (or 893 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 64200785 is about 8012.5392354734. The cubic root of 64200785 is about 400.4178654026.

The spelling of 64200785 in words is "sixty-four million, two hundred thousand, seven hundred eighty-five".