64394717 has 4 divisors (see below), whose sum is σ = 65209920. Its totient is φ = 63579516.

The previous prime is 64394663. The next prime is 64394767. The reversal of 64394717 is 71749346.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64394717 - 2¹⁸ = 64132573 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 (64394767) 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, 407483 + ... + 407640.

It is an arithmetic number, because the mean of its divisors is an integer number (16302480).

Almost surely, 2^64394717 is an apocalyptic number.

It is an amenable number.

64394717 is a deficient number, since it is larger than the sum of its proper divisors (815203).

64394717 is an equidigital number, since it uses as much as digits as its factorization.

64394717 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 815202.

The product of its digits is 127008, while the sum is 41.

The square root of 64394717 is about 8024.6318918689. The cubic root of 64394717 is about 400.8206422975.

The spelling of 64394717 in words is "sixty-four million, three hundred ninety-four thousand, seven hundred seventeen".