64680277 has 2 divisors, whose sum is σ = 64680278. Its totient is φ = 64680276.

The previous prime is 64680271. The next prime is 64680281. The reversal of 64680277 is 77208646.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64625521 + 54756 = 8039^2 + 234^2 .

It is a cyclic number.

It is not a de Polignac number, because 64680277 - 2⁷ = 64680149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64680271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32340138 + 32340139.

It is an arithmetic number, because the mean of its divisors is an integer number (32340139).

Almost surely, 2^64680277 is an apocalyptic number.

It is an amenable number.

64680277 is a deficient number, since it is larger than the sum of its proper divisors (1).

64680277 is an equidigital number, since it uses as much as digits as its factorization.

64680277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 40.

The square root of 64680277 is about 8042.4049263886. The cubic root of 64680277 is about 401.4122517445.

The spelling of 64680277 in words is "sixty-four million, six hundred eighty thousand, two hundred seventy-seven".