64644033 has 4 divisors (see below), whose sum is σ = 86192048. Its totient is φ = 43096020.

The previous prime is 64644031. The next prime is 64644043. The reversal of 64644033 is 33044646.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 64644033 - 2¹ = 64644031 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64644031) 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, 10774003 + ... + 10774008.

It is an arithmetic number, because the mean of its divisors is an integer number (21548012).

Almost surely, 2^64644033 is an apocalyptic number.

It is an amenable number.

64644033 is a deficient number, since it is larger than the sum of its proper divisors (21548015).

64644033 is a wasteful number, since it uses less digits than its factorization.

64644033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21548014.

The product of its (nonzero) digits is 20736, while the sum is 30.

The square root of 64644033 is about 8040.1513045465. The cubic root of 64644033 is about 401.3372597754.

Adding to 64644033 its reverse (33044646), we get a palindrome (97688679).

The spelling of 64644033 in words is "sixty-four million, six hundred forty-four thousand, thirty-three".