64628161 has 4 divisors (see below), whose sum is σ = 69599572. Its totient is φ = 59656752.

The previous prime is 64628143. The next prime is 64628167. The reversal of 64628161 is 16182646.

64628161 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.

It can be written as a sum of positive squares in 2 ways, for example, as 29593600 + 35034561 = 5440^2 + 5919^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64628161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64628167) 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, 2485686 + ... + 2485711.

It is an arithmetic number, because the mean of its divisors is an integer number (17399893).

Almost surely, 2^64628161 is an apocalyptic number.

It is an amenable number.

64628161 is a deficient number, since it is larger than the sum of its proper divisors (4971411).

64628161 is a wasteful number, since it uses less digits than its factorization.

64628161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4971410.

The product of its digits is 13824, while the sum is 34.

The square root of 64628161 is about 8039.1641978504. The cubic root of 64628161 is about 401.3044104099.

The spelling of 64628161 in words is "sixty-four million, six hundred twenty-eight thousand, one hundred sixty-one".