64194709 has 4 divisors (see below), whose sum is σ = 64210816. Its totient is φ = 64178604.

The previous prime is 64194701. The next prime is 64194733. The reversal of 64194709 is 90749146.

It is a happy number.

64194709 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 90749146 = 2 ⋅45374573.

It is a cyclic number.

It is not a de Polignac number, because 64194709 - 2³ = 64194701 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 (64194701) 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 3 ways as a sum of consecutive naturals, for example, 2812 + ... + 11674.

It is an arithmetic number, because the mean of its divisors is an integer number (16052704).

Almost surely, 2^64194709 is an apocalyptic number.

It is an amenable number.

64194709 is a deficient number, since it is larger than the sum of its proper divisors (16107).

64194709 is an equidigital number, since it uses as much as digits as its factorization.

64194709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16106.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 64194709 is about 8012.1600707924. The cubic root of 64194709 is about 400.4052330767.

The spelling of 64194709 in words is "sixty-four million, one hundred ninety-four thousand, seven hundred nine".