64405599 has 4 divisors (see below), whose sum is σ = 85874136. Its totient is φ = 42937064.

The previous prime is 64405541. The next prime is 64405603. The reversal of 64405599 is 99550446.

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 64405599 - 2⁸ = 64405343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64405599.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64405519) 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, 10734264 + ... + 10734269.

It is an arithmetic number, because the mean of its divisors is an integer number (21468534).

Almost surely, 2^64405599 is an apocalyptic number.

64405599 is a deficient number, since it is larger than the sum of its proper divisors (21468537).

64405599 is a wasteful number, since it uses less digits than its factorization.

64405599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21468536.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 64405599 is about 8025.3099005584. The cubic root of 64405599 is about 400.8432191214.

The spelling of 64405599 in words is "sixty-four million, four hundred five thousand, five hundred ninety-nine".