64494839 has 4 divisors (see below), whose sum is σ = 64724640. Its totient is φ = 64265040.

The previous prime is 64494827. The next prime is 64494853. The reversal of 64494839 is 93849446.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 64494839 - 2⁴ = 64494823 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64494793 and 64494802.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64494239) 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, 114479 + ... + 115040.

It is an arithmetic number, because the mean of its divisors is an integer number (16181160).

Almost surely, 2^64494839 is an apocalyptic number.

64494839 is a deficient number, since it is larger than the sum of its proper divisors (229801).

64494839 is a wasteful number, since it uses less digits than its factorization.

64494839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229800.

The product of its digits is 746496, while the sum is 47.

The square root of 64494839 is about 8030.8678858514. The cubic root of 64494839 is about 401.0282689756.

The spelling of 64494839 in words is "sixty-four million, four hundred ninety-four thousand, eight hundred thirty-nine".