64778313 has 16 divisors (see below), whose sum is σ = 94404096. Its totient is φ = 39333120.

The previous prime is 64778303. The next prime is 64778317. The reversal of 64778313 is 31387746.

64778313 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64778313 - 2¹⁴ = 64761929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64778317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18906 + ... + 22067.

It is an arithmetic number, because the mean of its divisors is an integer number (5900256).

Almost surely, 2^64778313 is an apocalyptic number.

It is an amenable number.

64778313 is a deficient number, since it is larger than the sum of its proper divisors (29625783).

64778313 is a wasteful number, since it uses less digits than its factorization.

64778313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41024.

The product of its digits is 84672, while the sum is 39.

The square root of 64778313 is about 8048.4975616571. The cubic root of 64778313 is about 401.6149564311.

The spelling of 64778313 in words is "sixty-four million, seven hundred seventy-eight thousand, three hundred thirteen".