64805513 has 16 divisors (see below), whose sum is σ = 72316800. Its totient is φ = 57758976.

The previous prime is 64805509. The next prime is 64805557. The reversal of 64805513 is 31550846.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 64805513 - 2² = 64805509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64805513.

It is not an unprimeable number, because it can be changed into a prime (64805113) 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, 41063 + ... + 42611.

It is an arithmetic number, because the mean of its divisors is an integer number (4519800).

Almost surely, 2^64805513 is an apocalyptic number.

It is an amenable number.

64805513 is a deficient number, since it is larger than the sum of its proper divisors (7511287).

64805513 is a wasteful number, since it uses less digits than its factorization.

64805513 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1696.

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 64805513 is about 8050.1871406819. The cubic root of 64805513 is about 401.6711604172.

The spelling of 64805513 in words is "sixty-four million, eight hundred five thousand, five hundred thirteen".