64785857 has 2 divisors, whose sum is σ = 64785858. Its totient is φ = 64785856.

The previous prime is 64785841. The next prime is 64785901. The reversal of 64785857 is 75858746.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54184321 + 10601536 = 7361^2 + 3256^2 .

It is a cyclic number.

It is not a de Polignac number, because 64785857 - 2⁴ = 64785841 is a prime.

It is not a weakly prime, because it can be changed into another prime (64787857) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32392928 + 32392929.

It is an arithmetic number, because the mean of its divisors is an integer number (32392929).

Almost surely, 2^64785857 is an apocalyptic number.

It is an amenable number.

64785857 is a deficient number, since it is larger than the sum of its proper divisors (1).

64785857 is an equidigital number, since it uses as much as digits as its factorization.

64785857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1881600, while the sum is 50.

The square root of 64785857 is about 8048.9662069113. The cubic root of 64785857 is about 401.6305463484.

The spelling of 64785857 in words is "sixty-four million, seven hundred eighty-five thousand, eight hundred fifty-seven".