64979986 has 4 divisors (see below), whose sum is σ = 97469982. Its totient is φ = 32489992.

The previous prime is 64979983. The next prime is 64980007. The reversal of 64979986 is 68997946.

64979986 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, and also an emirpimes, since its reverse is a distinct semiprime: 68997946 = 2 ⋅34498973.

It can be written as a sum of positive squares in only one way, i.e., 64496961 + 483025 = 8031^2 + 695^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 64979986.

It is not an unprimeable number, because it can be changed into a prime (64979983) 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 as a sum of consecutive naturals, namely, 16244995 + ... + 16244998.

Almost surely, 2^64979986 is an apocalyptic number.

64979986 is a deficient number, since it is larger than the sum of its proper divisors (32489996).

64979986 is a wasteful number, since it uses less digits than its factorization.

64979986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32489995.

The product of its digits is 5878656, while the sum is 58.

The square root of 64979986 is about 8061.0164371498. The cubic root of 64979986 is about 402.0313045430.

The spelling of 64979986 in words is "sixty-four million, nine hundred seventy-nine thousand, nine hundred eighty-six".