64697987 has 2 divisors, whose sum is σ = 64697988. Its totient is φ = 64697986.

The previous prime is 64697981. The next prime is 64697989. The reversal of 64697987 is 78979646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64697987 - 2²² = 60503683 is a prime.

Together with 64697989, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64697981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32348993 + 32348994.

It is an arithmetic number, because the mean of its divisors is an integer number (32348994).

Almost surely, 2^64697987 is an apocalyptic number.

64697987 is a deficient number, since it is larger than the sum of its proper divisors (1).

64697987 is an equidigital number, since it uses as much as digits as its factorization.

64697987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4572288, while the sum is 56.

The square root of 64697987 is about 8043.5058898468. The cubic root of 64697987 is about 401.4488850768.

The spelling of 64697987 in words is "sixty-four million, six hundred ninety-seven thousand, nine hundred eighty-seven".