64687979 has 8 divisors (see below), whose sum is σ = 67061760. Its totient is φ = 62332200.

The previous prime is 64687969. The next prime is 64688021. The reversal of 64687979 is 97978646.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64687979 - 2¹⁶ = 64622443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64687919) 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 7 ways as a sum of consecutive naturals, for example, 3044 + ... + 11774.

It is an arithmetic number, because the mean of its divisors is an integer number (8382720).

Almost surely, 2^64687979 is an apocalyptic number.

64687979 is a deficient number, since it is larger than the sum of its proper divisors (2373781).

64687979 is a wasteful number, since it uses less digits than its factorization.

64687979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9001.

The product of its digits is 4572288, while the sum is 56.

The square root of 64687979 is about 8042.8837490045. The cubic root of 64687979 is about 401.4281842389.

The spelling of 64687979 in words is "sixty-four million, six hundred eighty-seven thousand, nine hundred seventy-nine".