64859649 has 4 divisors (see below), whose sum is σ = 86479536. Its totient is φ = 43239764.

The previous prime is 64859647. The next prime is 64859659. The reversal of 64859649 is 94695846.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 64859649 - 2¹ = 64859647 is a prime.

It is not an unprimeable number, because it can be changed into a prime (64859647) 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, 10809939 + ... + 10809944.

It is an arithmetic number, because the mean of its divisors is an integer number (21619884).

Almost surely, 2^64859649 is an apocalyptic number.

It is an amenable number.

64859649 is a deficient number, since it is larger than the sum of its proper divisors (21619887).

64859649 is a wasteful number, since it uses less digits than its factorization.

64859649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21619886.

The product of its digits is 1866240, while the sum is 51.

The square root of 64859649 is about 8053.5488450744. The cubic root of 64859649 is about 401.7829760987.

The spelling of 64859649 in words is "sixty-four million, eight hundred fifty-nine thousand, six hundred forty-nine".