64871919 has 24 divisors (see below), whose sum is σ = 108605952. Its totient is φ = 36545040.

The previous prime is 64871897. The next prime is 64871921. The reversal of 64871919 is 91917846.

It is a happy number.

It is not a de Polignac number, because 64871919 - 2¹³ = 64863727 is a prime.

It is a super-2 number, since 2×64871919² = 8416731749485122, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64871959) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2779 + ... + 11724.

It is an arithmetic number, because the mean of its divisors is an integer number (4525248).

Almost surely, 2^64871919 is an apocalyptic number.

64871919 is a deficient number, since it is larger than the sum of its proper divisors (43734033).

64871919 is a wasteful number, since it uses less digits than its factorization.

64871919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14587 (or 14584 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 64871919 is about 8054.3105850222. The cubic root of 64871919 is about 401.8083106293.

The spelling of 64871919 in words is "sixty-four million, eight hundred seventy-one thousand, nine hundred nineteen".