64673779 has 2 divisors, whose sum is σ = 64673780. Its totient is φ = 64673778.

The previous prime is 64673771. The next prime is 64673837. The reversal of 64673779 is 97737646.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64673779 - 2³ = 64673771 is a prime.

It is not a weakly prime, because it can be changed into another prime (64673771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32336889 + 32336890.

It is an arithmetic number, because the mean of its divisors is an integer number (32336890).

Almost surely, 2^64673779 is an apocalyptic number.

64673779 is a deficient number, since it is larger than the sum of its proper divisors (1).

64673779 is an equidigital number, since it uses as much as digits as its factorization.

64673779 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1333584, while the sum is 49.

The square root of 64673779 is about 8042.0009326038. Note that the first 3 decimals coincide. The cubic root of 64673779 is about 401.3988088822.

The spelling of 64673779 in words is "sixty-four million, six hundred seventy-three thousand, seven hundred seventy-nine".