64394405 has 4 divisors (see below), whose sum is σ = 77273292. Its totient is φ = 51515520.

The previous prime is 64394399. The next prime is 64394423. The reversal of 64394405 is 50449346.

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

It can be written as a sum of positive squares in 2 ways, for example, as 8473921 + 55920484 = 2911^2 + 7478^2 .

It is not a de Polignac number, because 64394405 - 2¹² = 64390309 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6439436 + ... + 6439445.

It is an arithmetic number, because the mean of its divisors is an integer number (19318323).

Almost surely, 2^64394405 is an apocalyptic number.

It is an amenable number.

64394405 is a deficient number, since it is larger than the sum of its proper divisors (12878887).

64394405 is a wasteful number, since it uses less digits than its factorization.

64394405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12878886.

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

The square root of 64394405 is about 8024.6124517013. The cubic root of 64394405 is about 400.8199949554.

The spelling of 64394405 in words is "sixty-four million, three hundred ninety-four thousand, four hundred five".