64422399 has 4 divisors (see below), whose sum is σ = 85896536. Its totient is φ = 42948264.

The previous prime is 64422377. The next prime is 64422409. The reversal of 64422399 is 99322446.

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

It is not a de Polignac number, because 64422399 - 2⁷ = 64422271 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 (64422499) 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, 10737064 + ... + 10737069.

It is an arithmetic number, because the mean of its divisors is an integer number (21474134).

Almost surely, 2^64422399 is an apocalyptic number.

64422399 is a deficient number, since it is larger than the sum of its proper divisors (21474137).

64422399 is a wasteful number, since it uses less digits than its factorization.

64422399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21474136.

The product of its digits is 93312, while the sum is 39.

The square root of 64422399 is about 8026.3565208630. The cubic root of 64422399 is about 400.8780689934.

The spelling of 64422399 in words is "sixty-four million, four hundred twenty-two thousand, three hundred ninety-nine".