64478377 has 2 divisors, whose sum is σ = 64478378. Its totient is φ = 64478376.

The previous prime is 64478341. The next prime is 64478411. The reversal of 64478377 is 77387446.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 63107136 + 1371241 = 7944^2 + 1171^2 .

It is a cyclic number.

It is not a de Polignac number, because 64478377 - 2¹⁹ = 63954089 is a prime.

It is a super-2 number, since 2×64478377² = 8314922201108258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64478317) 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, 32239188 + 32239189.

It is an arithmetic number, because the mean of its divisors is an integer number (32239189).

Almost surely, 2^64478377 is an apocalyptic number.

It is an amenable number.

64478377 is a deficient number, since it is larger than the sum of its proper divisors (1).

64478377 is an equidigital number, since it uses as much as digits as its factorization.

64478377 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 790272, while the sum is 46.

The square root of 64478377 is about 8029.8429000822. The cubic root of 64478377 is about 400.9941458879.

The spelling of 64478377 in words is "sixty-four million, four hundred seventy-eight thousand, three hundred seventy-seven".