64545623 has 8 divisors (see below), whose sum is σ = 66528000. Its totient is φ = 62585208.

The previous prime is 64545601. The next prime is 64545631. The reversal of 64545623 is 32654546.

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 64545623 - 2²⁴ = 47768407 is a prime.

It is a super-2 number, since 2×64545623² = 8332274896916258, 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 (64545673) 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, 578 + ... + 11376.

It is an arithmetic number, because the mean of its divisors is an integer number (8316000).

Almost surely, 2^64545623 is an apocalyptic number.

64545623 is a deficient number, since it is larger than the sum of its proper divisors (1982377).

64545623 is a wasteful number, since it uses less digits than its factorization.

64545623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10981.

The product of its digits is 86400, while the sum is 35.

The square root of 64545623 is about 8034.0290639255. The cubic root of 64545623 is about 401.1334994965.

The spelling of 64545623 in words is "sixty-four million, five hundred forty-five thousand, six hundred twenty-three".