64805623 has 8 divisors (see below), whose sum is σ = 65698160. Its totient is φ = 63918720.

The previous prime is 64805579. The next prime is 64805669. The reversal of 64805623 is 32650846.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 64805623 - 2²⁵ = 31251191 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 (64805023) 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 7 ways as a sum of consecutive naturals, for example, 25036 + ... + 27502.

It is an arithmetic number, because the mean of its divisors is an integer number (8212270).

Almost surely, 2^64805623 is an apocalyptic number.

64805623 is a deficient number, since it is larger than the sum of its proper divisors (892537).

64805623 is a wasteful number, since it uses less digits than its factorization.

64805623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2817.

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 64805623 is about 8050.1939728183. The cubic root of 64805623 is about 401.6713876808.

The spelling of 64805623 in words is "sixty-four million, eight hundred five thousand, six hundred twenty-three".