64687823 has 4 divisors (see below), whose sum is σ = 64718328. Its totient is φ = 64657320.

The previous prime is 64687817. The next prime is 64687829. The reversal of 64687823 is 32878646.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (64687817) and next prime (64687829).

It is a cyclic number.

It is not a de Polignac number, because 64687823 - 2¹² = 64683727 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 (64687829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11813 + ... + 16398.

It is an arithmetic number, because the mean of its divisors is an integer number (16179582).

Almost surely, 2^64687823 is an apocalyptic number.

64687823 is a deficient number, since it is larger than the sum of its proper divisors (30505).

64687823 is a wasteful number, since it uses less digits than its factorization.

64687823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30504.

The product of its digits is 387072, while the sum is 44.

The square root of 64687823 is about 8042.8740509845. The cubic root of 64687823 is about 401.4278615470.

The spelling of 64687823 in words is "sixty-four million, six hundred eighty-seven thousand, eight hundred twenty-three".