64689859 has 4 divisors (see below), whose sum is σ = 69666016. Its totient is φ = 59713704.

The previous prime is 64689827. The next prime is 64689883. The reversal of 64689859 is 95898646.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 95898646 = 2 ⋅47949323.

It is a cyclic number.

It is not a de Polignac number, because 64689859 - 2⁵ = 64689827 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64689059) 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, 2488059 + ... + 2488084.

It is an arithmetic number, because the mean of its divisors is an integer number (17416504).

Almost surely, 2^64689859 is an apocalyptic number.

64689859 is a deficient number, since it is larger than the sum of its proper divisors (4976157).

64689859 is a wasteful number, since it uses less digits than its factorization.

64689859 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4976156.

The product of its digits is 3732480, while the sum is 55.

The square root of 64689859 is about 8043.0006216586. Note that the first 3 decimals coincide. The cubic root of 64689859 is about 401.4320730483.

The spelling of 64689859 in words is "sixty-four million, six hundred eighty-nine thousand, eight hundred fifty-nine".