64287889 has 4 divisors (see below), whose sum is σ = 64697524. Its totient is φ = 63878256.

The previous prime is 64287871. The next prime is 64287911. The reversal of 64287889 is 98878246.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98878246 = 2 ⋅49439123.

It can be written as a sum of positive squares in 2 ways, for example, as 46580625 + 17707264 = 6825^2 + 4208^2 .

It is a cyclic number.

It is not a de Polignac number, because 64287889 - 2²⁵ = 30733457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64287859) 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, 204582 + ... + 204895.

It is an arithmetic number, because the mean of its divisors is an integer number (16174381).

Almost surely, 2^64287889 is an apocalyptic number.

It is an amenable number.

64287889 is a deficient number, since it is larger than the sum of its proper divisors (409635).

64287889 is a wasteful number, since it uses less digits than its factorization.

64287889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409634.

The product of its digits is 1548288, while the sum is 52.

The square root of 64287889 is about 8017.9728734887. The cubic root of 64287889 is about 400.5988716843.

The spelling of 64287889 in words is "sixty-four million, two hundred eighty-seven thousand, eight hundred eighty-nine".