64397987 has 2 divisors, whose sum is σ = 64397988. Its totient is φ = 64397986.

The previous prime is 64397981. The next prime is 64398007. The reversal of 64397987 is 78979346.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64397987 - 2¹⁰ = 64396963 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (64397981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32198993 + 32198994.

It is an arithmetic number, because the mean of its divisors is an integer number (32198994).

Almost surely, 2^64397987 is an apocalyptic number.

64397987 is a deficient number, since it is larger than the sum of its proper divisors (1).

64397987 is an equidigital number, since it uses as much as digits as its factorization.

64397987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2286144, while the sum is 53.

The square root of 64397987 is about 8024.8356369461. The cubic root of 64397987 is about 400.8274268153.

The spelling of 64397987 in words is "sixty-four million, three hundred ninety-seven thousand, nine hundred eighty-seven".