64220977 has 2 divisors, whose sum is σ = 64220978. Its totient is φ = 64220976.

The previous prime is 64220939. The next prime is 64221013. The reversal of 64220977 is 77902246.

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., 62346816 + 1874161 = 7896^2 + 1369^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64220977 is a prime.

It is not a weakly prime, because it can be changed into another prime (64220927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32110488 + 32110489.

It is an arithmetic number, because the mean of its divisors is an integer number (32110489).

Almost surely, 2^64220977 is an apocalyptic number.

It is an amenable number.

64220977 is a deficient number, since it is larger than the sum of its proper divisors (1).

64220977 is an equidigital number, since it uses as much as digits as its factorization.

64220977 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 64220977 is about 8013.7991614465. The cubic root of 64220977 is about 400.4598399156.

The spelling of 64220977 in words is "sixty-four million, two hundred twenty thousand, nine hundred seventy-seven".