64677257 has 2 divisors, whose sum is σ = 64677258. Its totient is φ = 64677256.

The previous prime is 64677233. The next prime is 64677271. The reversal of 64677257 is 75277646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64384576 + 292681 = 8024^2 + 541^2 .

It is a cyclic number.

It is not a de Polignac number, because 64677257 - 2⁸ = 64677001 is a prime.

It is not a weakly prime, because it can be changed into another prime (64677227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32338628 + 32338629.

It is an arithmetic number, because the mean of its divisors is an integer number (32338629).

Almost surely, 2^64677257 is an apocalyptic number.

It is an amenable number.

64677257 is a deficient number, since it is larger than the sum of its proper divisors (1).

64677257 is an equidigital number, since it uses as much as digits as its factorization.

64677257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 493920, while the sum is 44.

The square root of 64677257 is about 8042.2171694129. The cubic root of 64677257 is about 401.4060041735.

The spelling of 64677257 in words is "sixty-four million, six hundred seventy-seven thousand, two hundred fifty-seven".