64989911 has 4 divisors (see below), whose sum is σ = 74274192. Its totient is φ = 55705632.

The previous prime is 64989907. The next prime is 64989917. The reversal of 64989911 is 11998946.

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

It is a cyclic number.

It is not a de Polignac number, because 64989911 - 2² = 64989907 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64989917) 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 3 ways as a sum of consecutive naturals, for example, 4642130 + ... + 4642143.

It is an arithmetic number, because the mean of its divisors is an integer number (18568548).

Almost surely, 2^64989911 is an apocalyptic number.

64989911 is a deficient number, since it is larger than the sum of its proper divisors (9284281).

64989911 is an equidigital number, since it uses as much as digits as its factorization.

64989911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9284280.

The product of its digits is 139968, while the sum is 47.

The square root of 64989911 is about 8061.6320307987. The cubic root of 64989911 is about 402.0517721660.

The spelling of 64989911 in words is "sixty-four million, nine hundred eighty-nine thousand, nine hundred eleven".