64694109 has 4 divisors (see below), whose sum is σ = 86258816. Its totient is φ = 43129404.

The previous prime is 64694089. The next prime is 64694131. The reversal of 64694109 is 90149646.

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 64694109 - 2⁹ = 64693597 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64694309) 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, 10782349 + ... + 10782354.

It is an arithmetic number, because the mean of its divisors is an integer number (21564704).

Almost surely, 2^64694109 is an apocalyptic number.

It is an amenable number.

64694109 is a deficient number, since it is larger than the sum of its proper divisors (21564707).

64694109 is a wasteful number, since it uses less digits than its factorization.

64694109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21564706.

The product of its (nonzero) digits is 46656, while the sum is 39.

The square root of 64694109 is about 8043.2648221975. The cubic root of 64694109 is about 401.4408639623.

The spelling of 64694109 in words is "sixty-four million, six hundred ninety-four thousand, one hundred nine".