64871613 has 6 divisors (see below), whose sum is σ = 93703454. Its totient is φ = 43247736.

The previous prime is 64871603. The next prime is 64871617. The reversal of 64871613 is 31617846.

64871613 is a `hidden beast` number, since 648 + 7 + 1 + 6 + 1 + 3 = 666.

It can be written as a sum of positive squares in only one way, i.e., 40487769 + 24383844 = 6363^2 + 4938^2 .

It is not a de Polignac number, because 64871613 - 2⁵ = 64871581 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 (64871617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3603970 + ... + 3603987.

Almost surely, 2^64871613 is an apocalyptic number.

It is an amenable number.

64871613 is a deficient number, since it is larger than the sum of its proper divisors (28831841).

64871613 is a wasteful number, since it uses less digits than its factorization.

64871613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7207963 (or 7207960 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 64871613 is about 8054.2915889605. The cubic root of 64871613 is about 401.8076788534.

It can be divided in two parts, 6487 and 1613, that added together give a square (8100 = 90²).

The spelling of 64871613 in words is "sixty-four million, eight hundred seventy-one thousand, six hundred thirteen".