64208987 has 4 divisors (see below), whose sum is σ = 66423120. Its totient is φ = 61994856.

The previous prime is 64208971. The next prime is 64209007. The reversal of 64208987 is 78980246.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64208987 - 2⁴ = 64208971 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64208587) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1107023 + ... + 1107080.

It is an arithmetic number, because the mean of its divisors is an integer number (16605780).

Almost surely, 2^64208987 is an apocalyptic number.

64208987 is a deficient number, since it is larger than the sum of its proper divisors (2214133).

64208987 is a wasteful number, since it uses less digits than its factorization.

64208987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2214132.

The product of its (nonzero) digits is 193536, while the sum is 44.

The square root of 64208987 is about 8013.0510418941. The cubic root of 64208987 is about 400.4349165310.

The spelling of 64208987 in words is "sixty-four million, two hundred eight thousand, nine hundred eighty-seven".