64539909 has 80 divisors (see below), whose sum is σ = 118483200. Its totient is φ = 34927200.

The previous prime is 64539889. The next prime is 64539911. The reversal of 64539909 is 90993546.

It is a happy number.

64539909 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 64539909 - 2¹¹ = 64537861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64539929) 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 in 79 ways as a sum of consecutive naturals, for example, 638959 + ... + 639059.

It is an arithmetic number, because the mean of its divisors is an integer number (1481040).

Almost surely, 2^64539909 is an apocalyptic number.

64539909 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

64539909 is a deficient number, since it is larger than the sum of its proper divisors (53943291).

64539909 is a wasteful number, since it uses less digits than its factorization.

64539909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 262440, while the sum is 45.

The square root of 64539909 is about 8033.6734436993. The cubic root of 64539909 is about 401.1216621617.

The spelling of 64539909 in words is "sixty-four million, five hundred thirty-nine thousand, nine hundred nine".