64434939 has 4 divisors (see below), whose sum is σ = 85913256. Its totient is φ = 42956624.

The previous prime is 64434919. The next prime is 64434943. The reversal of 64434939 is 93943446.

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 64434939 - 2¹¹ = 64432891 is a prime.

It is a super-2 number, since 2×64434939² = 8303722727867442, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64434939.

It is not an unprimeable number, because it can be changed into a prime (64434919) 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, 10739154 + ... + 10739159.

It is an arithmetic number, because the mean of its divisors is an integer number (21478314).

Almost surely, 2^64434939 is an apocalyptic number.

64434939 is a deficient number, since it is larger than the sum of its proper divisors (21478317).

64434939 is a wasteful number, since it uses less digits than its factorization.

64434939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21478316.

The product of its digits is 279936, while the sum is 42.

The square root of 64434939 is about 8027.1376592158. The cubic root of 64434939 is about 400.9040779847.

The spelling of 64434939 in words is "sixty-four million, four hundred thirty-four thousand, nine hundred thirty-nine".