64394247 has 8 divisors (see below), whose sum is σ = 86486256. Its totient is φ = 42615872.

The previous prime is 64394237. The next prime is 64394269. The reversal of 64394247 is 74249346.

64394247 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 64394247 - 2⁷ = 64394119 is a prime.

It is a super-3 number, since 3×64394247³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64394237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77928 + ... + 78749.

It is an arithmetic number, because the mean of its divisors is an integer number (10810782).

Almost surely, 2^64394247 is an apocalyptic number.

64394247 is a deficient number, since it is larger than the sum of its proper divisors (22092009).

64394247 is a wasteful number, since it uses less digits than its factorization.

64394247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156817.

The product of its digits is 145152, while the sum is 39.

The square root of 64394247 is about 8024.6026069831. The cubic root of 64394247 is about 400.8196671339.

The spelling of 64394247 in words is "sixty-four million, three hundred ninety-four thousand, two hundred forty-seven".