64989709 has 16 divisors (see below), whose sum is σ = 69854400. Its totient is φ = 60286464.

The previous prime is 64989707. The next prime is 64989719. The reversal of 64989709 is 90798946.

It is a cyclic number.

It is not a de Polignac number, because 64989709 - 2¹ = 64989707 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 (64989707) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 329799 + ... + 329995.

It is an arithmetic number, because the mean of its divisors is an integer number (4365900).

Almost surely, 2^64989709 is an apocalyptic number.

It is an amenable number.

64989709 is a deficient number, since it is larger than the sum of its proper divisors (4864691).

64989709 is a wasteful number, since it uses less digits than its factorization.

64989709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 492.

The product of its (nonzero) digits is 979776, while the sum is 52.

The square root of 64989709 is about 8061.6195023085. The cubic root of 64989709 is about 402.0513556165.

The spelling of 64989709 in words is "sixty-four million, nine hundred eighty-nine thousand, seven hundred nine".