64912399 has 4 divisors (see below), whose sum is σ = 65301264. Its totient is φ = 64523536.

The previous prime is 64912363. The next prime is 64912423. The reversal of 64912399 is 99321946.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99321946 = 2 ⋅49660973.

It is a cyclic number.

It is not a de Polignac number, because 64912399 - 2¹³ = 64904207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64912339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194182 + ... + 194515.

It is an arithmetic number, because the mean of its divisors is an integer number (16325316).

Almost surely, 2^64912399 is an apocalyptic number.

64912399 is a deficient number, since it is larger than the sum of its proper divisors (388865).

64912399 is a wasteful number, since it uses less digits than its factorization.

64912399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 388864.

The product of its digits is 104976, while the sum is 43.

The square root of 64912399 is about 8056.8231332207. The cubic root of 64912399 is about 401.8918692202.

The spelling of 64912399 in words is "sixty-four million, nine hundred twelve thousand, three hundred ninety-nine".