64649709 has 6 divisors (see below), whose sum is σ = 93382926. Its totient is φ = 43099800.

The previous prime is 64649699. The next prime is 64649713. The reversal of 64649709 is 90794646.

It can be written as a sum of positive squares in only one way, i.e., 63202500 + 1447209 = 7950^2 + 1203^2 .

It is not a de Polignac number, because 64649709 - 2⁹ = 64649197 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64649009) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3591642 + ... + 3591659.

It is an arithmetic number, because the mean of its divisors is an integer number (15563821).

Almost surely, 2^64649709 is an apocalyptic number.

It is an amenable number.

64649709 is a deficient number, since it is larger than the sum of its proper divisors (28733217).

64649709 is a wasteful number, since it uses less digits than its factorization.

64649709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7183307 (or 7183304 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 45.

The square root of 64649709 is about 8040.5042752305. The cubic root of 64649709 is about 401.3490057608.

The spelling of 64649709 in words is "sixty-four million, six hundred forty-nine thousand, seven hundred nine".