64533645 has 32 divisors (see below), whose sum is σ = 125159040. Its totient is φ = 31288320.

The previous prime is 64533641. The next prime is 64533659. The reversal of 64533645 is 54633546.

64533645 is a `hidden beast` number, since 6 + 4 + 5 + 3 + 3 + 645 = 666.

It is not a de Polignac number, because 64533645 - 2² = 64533641 is a prime.

It is a super-3 number, since 3×64533645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64533641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20244 + ... + 23213.

It is an arithmetic number, because the mean of its divisors is an integer number (3911220).

Almost surely, 2^64533645 is an apocalyptic number.

It is an amenable number.

64533645 is a deficient number, since it is larger than the sum of its proper divisors (60625395).

64533645 is a wasteful number, since it uses less digits than its factorization.

64533645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43482 (or 43476 counting only the distinct ones).

The product of its digits is 129600, while the sum is 36.

The square root of 64533645 is about 8033.2835752263. The cubic root of 64533645 is about 401.1086846236.

Subtracting from 64533645 its reverse (54633546), we obtain a palindrome (9900099).

The spelling of 64533645 in words is "sixty-four million, five hundred thirty-three thousand, six hundred forty-five".