64787857 has 2 divisors, whose sum is σ = 64787858. Its totient is φ = 64787856.

The previous prime is 64787839. The next prime is 64787873. The reversal of 64787857 is 75878746.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 32706961 + 32080896 = 5719^2 + 5664^2 .

It is a cyclic number.

It is not a de Polignac number, because 64787857 - 2¹⁹ = 64263569 is a prime.

It is not a weakly prime, because it can be changed into another prime (64787837) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32393928 + 32393929.

It is an arithmetic number, because the mean of its divisors is an integer number (32393929).

Almost surely, 2^64787857 is an apocalyptic number.

It is an amenable number.

64787857 is a deficient number, since it is larger than the sum of its proper divisors (1).

64787857 is an equidigital number, since it uses as much as digits as its factorization.

64787857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2634240, while the sum is 52.

The square root of 64787857 is about 8049.0904455100. The cubic root of 64787857 is about 401.6346792094.

The spelling of 64787857 in words is "sixty-four million, seven hundred eighty-seven thousand, eight hundred fifty-seven".