64604641 has 4 divisors (see below), whose sum is σ = 68404932. Its totient is φ = 60804352.

The previous prime is 64604623. The next prime is 64604647. The reversal of 64604641 is 14640646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 37564641 + 27040000 = 6129^2 + 5200^2 .

It is a cyclic number.

It is not a de Polignac number, because 64604641 - 2²³ = 56216033 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64604647) 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, 1900120 + ... + 1900153.

It is an arithmetic number, because the mean of its divisors is an integer number (17101233).

Almost surely, 2^64604641 is an apocalyptic number.

It is an amenable number.

64604641 is a deficient number, since it is larger than the sum of its proper divisors (3800291).

64604641 is a wasteful number, since it uses less digits than its factorization.

64604641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3800290.

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 64604641 is about 8037.7012260969. The cubic root of 64604641 is about 401.2557225272.

The spelling of 64604641 in words is "sixty-four million, six hundred four thousand, six hundred forty-one".