64871839 has 4 divisors (see below), whose sum is σ = 64890360. Its totient is φ = 64853320.

The previous prime is 64871827. The next prime is 64871861. The reversal of 64871839 is 93817846.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93817846 = 2 ⋅46908923.

It is a cyclic number.

It is not a de Polignac number, because 64871839 - 2¹³ = 64863647 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 (64871039) 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, 2224 + ... + 11605.

It is an arithmetic number, because the mean of its divisors is an integer number (16222590).

Almost surely, 2^64871839 is an apocalyptic number.

64871839 is a deficient number, since it is larger than the sum of its proper divisors (18521).

64871839 is a wasteful number, since it uses less digits than its factorization.

64871839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18520.

The product of its digits is 290304, while the sum is 46.

The square root of 64871839 is about 8054.3056187359. The cubic root of 64871839 is about 401.8081454593.

The spelling of 64871839 in words is "sixty-four million, eight hundred seventy-one thousand, eight hundred thirty-nine".