64331447 has 4 divisors (see below), whose sum is σ = 64350936. Its totient is φ = 64311960.

The previous prime is 64331413. The next prime is 64331489. The reversal of 64331447 is 74413346.

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 64331447 - 2⁸ = 64331191 is a prime.

It is a super-2 number, since 2×64331447² = 8277070146227618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64331147) 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, 3428 + ... + 11849.

It is an arithmetic number, because the mean of its divisors is an integer number (16087734).

Almost surely, 2^64331447 is an apocalyptic number.

64331447 is a deficient number, since it is larger than the sum of its proper divisors (19489).

64331447 is a wasteful number, since it uses less digits than its factorization.

64331447 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19488.

The product of its digits is 24192, while the sum is 32.

The square root of 64331447 is about 8020.6886861416. The cubic root of 64331447 is about 400.6893259752.

The spelling of 64331447 in words is "sixty-four million, three hundred thirty-one thousand, four hundred forty-seven".