64995839 has 4 divisors (see below), whose sum is σ = 65060520. Its totient is φ = 64931160.

The previous prime is 64995817. The next prime is 64995851. The reversal of 64995839 is 93859946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 93859946 = 2 ⋅46929973.

It is a cyclic number.

It is not a de Polignac number, because 64995839 - 2¹² = 64991743 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 (64995859) 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, 30809 + ... + 32850.

It is an arithmetic number, because the mean of its divisors is an integer number (16265130).

Almost surely, 2^64995839 is an apocalyptic number.

64995839 is a deficient number, since it is larger than the sum of its proper divisors (64681).

64995839 is a wasteful number, since it uses less digits than its factorization.

64995839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64680.

The product of its digits is 2099520, while the sum is 53.

The square root of 64995839 is about 8061.9996899032. Note that the first 3 decimals coincide. The cubic root of 64995839 is about 402.0639960656.

The spelling of 64995839 in words is "sixty-four million, nine hundred ninety-five thousand, eight hundred thirty-nine".