64965839 has 8 divisors (see below), whose sum is σ = 66262560. Its totient is φ = 63692208.

The previous prime is 64965833. The next prime is 64965841. The reversal of 64965839 is 93856946.

It is not a de Polignac number, because 64965839 - 2⁸ = 64965583 is a prime.

It is a Duffinian number.

Its product of digits (1399680) is a multiple of the sum of its prime divisors (240).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64965833) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388934 + ... + 389100.

It is an arithmetic number, because the mean of its divisors is an integer number (8282820).

Almost surely, 2^64965839 is an apocalyptic number.

64965839 is a deficient number, since it is larger than the sum of its proper divisors (1296721).

64965839 is an frugal number, since it uses more digits than its factorization.

64965839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 240 counting only the distinct ones).

The product of its digits is 1399680, while the sum is 50.

The square root of 64965839 is about 8060.1388945849. The cubic root of 64965839 is about 402.0021265863.

The spelling of 64965839 in words is "sixty-four million, nine hundred sixty-five thousand, eight hundred thirty-nine".