64985619 has 4 divisors (see below), whose sum is σ = 86647496. Its totient is φ = 43323744.

The previous prime is 64985617. The next prime is 64985623. The reversal of 64985619 is 91658946.

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

It is not a de Polignac number, because 64985619 - 2¹ = 64985617 is a prime.

It is a super-2 number, since 2×64985619² = 8446261353626322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64985617) 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, 10830934 + ... + 10830939.

It is an arithmetic number, because the mean of its divisors is an integer number (21661874).

Almost surely, 2^64985619 is an apocalyptic number.

64985619 is a deficient number, since it is larger than the sum of its proper divisors (21661877).

64985619 is a wasteful number, since it uses less digits than its factorization.

64985619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21661876.

The product of its digits is 466560, while the sum is 48.

The square root of 64985619 is about 8061.3658272032. The cubic root of 64985619 is about 402.0429213348.

It can be divided in two parts, 649 and 85619, that added together give a palindrome (86268).

The spelling of 64985619 in words is "sixty-four million, nine hundred eighty-five thousand, six hundred nineteen".