64400447 has 8 divisors (see below), whose sum is σ = 66286080. Its totient is φ = 62541400.

The previous prime is 64400419. The next prime is 64400449. The reversal of 64400447 is 74400446.

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 64400447 - 2⁶ = 64400383 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 (64400449) 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 7 ways as a sum of consecutive naturals, for example, 1679 + ... + 11472.

It is an arithmetic number, because the mean of its divisors is an integer number (8285760).

Almost surely, 2^64400447 is an apocalyptic number.

64400447 is a deficient number, since it is larger than the sum of its proper divisors (1885633).

64400447 is a wasteful number, since it uses less digits than its factorization.

64400447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13293.

The product of its (nonzero) digits is 10752, while the sum is 29.

The square root of 64400447 is about 8024.9889096497. The cubic root of 64400447 is about 400.8325306131.

Subtracting 64400447 from its reverse (74400446), we obtain a palindrome (9999999).

The spelling of 64400447 in words is "sixty-four million, four hundred thousand, four hundred forty-seven".