64523623 has 4 divisors (see below), whose sum is σ = 64910160. Its totient is φ = 64137088.

The previous prime is 64523611. The next prime is 64523633. The reversal of 64523623 is 32632546.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64523623 is a prime.

It is a super-2 number, since 2×64523623² = 8326595850092258, 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 (64523633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 193018 + ... + 193351.

It is an arithmetic number, because the mean of its divisors is an integer number (16227540).

Almost surely, 2^64523623 is an apocalyptic number.

64523623 is a deficient number, since it is larger than the sum of its proper divisors (386537).

64523623 is a wasteful number, since it uses less digits than its factorization.

64523623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 386536.

The product of its digits is 25920, while the sum is 31.

The square root of 64523623 is about 8032.6597712090. The cubic root of 64523623 is about 401.0879196446.

The spelling of 64523623 in words is "sixty-four million, five hundred twenty-three thousand, six hundred twenty-three".