64709823 has 8 divisors (see below), whose sum is σ = 86316928. Its totient is φ = 43121304.

The previous prime is 64709783. The next prime is 64709831. The reversal of 64709823 is 32890746.

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

It is not a de Polignac number, because 64709823 - 2¹⁴ = 64693439 is a prime.

It is a super-2 number, since 2×64709823² = 8374722385382658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64709923) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11340 + ... + 16062.

It is an arithmetic number, because the mean of its divisors is an integer number (10789616).

Almost surely, 2^64709823 is an apocalyptic number.

64709823 is a deficient number, since it is larger than the sum of its proper divisors (21607105).

64709823 is a wasteful number, since it uses less digits than its factorization.

64709823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9293.

The product of its (nonzero) digits is 72576, while the sum is 39.

The square root of 64709823 is about 8044.2416050241. The cubic root of 64709823 is about 401.4733642479.

The spelling of 64709823 in words is "sixty-four million, seven hundred nine thousand, eight hundred twenty-three".