64405439 has 8 divisors (see below), whose sum is σ = 73664640. Its totient is φ = 55160856.

The previous prime is 64405417. The next prime is 64405457. The reversal of 64405439 is 93450446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64405439 - 2⁸ = 64405183 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64405399 and 64405408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64405409) 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, 8492 + ... + 14174.

It is an arithmetic number, because the mean of its divisors is an integer number (9208080).

Almost surely, 2^64405439 is an apocalyptic number.

64405439 is a deficient number, since it is larger than the sum of its proper divisors (9259201).

64405439 is a wasteful number, since it uses less digits than its factorization.

64405439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7309.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 64405439 is about 8025.2999320898. The cubic root of 64405439 is about 400.8428871887.

The spelling of 64405439 in words is "sixty-four million, four hundred five thousand, four hundred thirty-nine".