64919887 has 2 divisors, whose sum is σ = 64919888. Its totient is φ = 64919886.

The previous prime is 64919879. The next prime is 64919891. The reversal of 64919887 is 78891946.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64919887 - 2³ = 64919879 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (64919587) 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, 32459943 + 32459944.

It is an arithmetic number, because the mean of its divisors is an integer number (32459944).

Almost surely, 2^64919887 is an apocalyptic number.

64919887 is a deficient number, since it is larger than the sum of its proper divisors (1).

64919887 is an equidigital number, since it uses as much as digits as its factorization.

64919887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 870912, while the sum is 52.

The square root of 64919887 is about 8057.2878191113. The cubic root of 64919887 is about 401.9073221006.

The spelling of 64919887 in words is "sixty-four million, nine hundred nineteen thousand, eight hundred eighty-seven".