64519861 has 16 divisors (see below), whose sum is σ = 76455936. Its totient is φ = 53300016.

The previous prime is 64519843. The next prime is 64519907. The reversal of 64519861 is 16891546.

It is not a de Polignac number, because 64519861 - 2¹¹ = 64517813 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64519061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20580 + ... + 23506.

It is an arithmetic number, because the mean of its divisors is an integer number (4778496).

Almost surely, 2^64519861 is an apocalyptic number.

It is an amenable number.

64519861 is a deficient number, since it is larger than the sum of its proper divisors (11936075).

64519861 is a wasteful number, since it uses less digits than its factorization.

64519861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3048.

The product of its digits is 51840, while the sum is 40.

The square root of 64519861 is about 8032.4255987840. The cubic root of 64519861 is about 401.0801244526.

The spelling of 64519861 in words is "sixty-four million, five hundred nineteen thousand, eight hundred sixty-one".