64577857 has 2 divisors, whose sum is σ = 64577858. Its totient is φ = 64577856.

The previous prime is 64577831. The next prime is 64577861. The reversal of 64577857 is 75877546.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53714241 + 10863616 = 7329^2 + 3296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64577857 is a prime.

It is a super-2 number, since 2×64577857² = 8340599229424898, which contains 22 as substring.

It is a zygodrome in base 3.

It is a self number, because there is not a number n which added to its sum of digits gives 64577857.

It is not a weakly prime, because it can be changed into another prime (64577657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32288928 + 32288929.

It is an arithmetic number, because the mean of its divisors is an integer number (32288929).

Almost surely, 2^64577857 is an apocalyptic number.

It is an amenable number.

64577857 is a deficient number, since it is larger than the sum of its proper divisors (1).

64577857 is an equidigital number, since it uses as much as digits as its factorization.

64577857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1646400, while the sum is 49.

The square root of 64577857 is about 8036.0349053498. The cubic root of 64577857 is about 401.2002635661.

The spelling of 64577857 in words is "sixty-four million, five hundred seventy-seven thousand, eight hundred fifty-seven".