64644841 has 4 divisors (see below), whose sum is σ = 64873552. Its totient is φ = 64416132.

The previous prime is 64644817. The next prime is 64644847. The reversal of 64644841 is 14844646.

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, and also an emirpimes, since its reverse is a distinct semiprime: 14844646 = 2 ⋅7422323.

It is a cyclic number.

It is not a de Polignac number, because 64644841 - 2¹⁵ = 64612073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64644841.

It is not an unprimeable number, because it can be changed into a prime (64644847) 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, 113931 + ... + 114496.

It is an arithmetic number, because the mean of its divisors is an integer number (16218388).

Almost surely, 2^64644841 is an apocalyptic number.

It is an amenable number.

64644841 is a deficient number, since it is larger than the sum of its proper divisors (228711).

64644841 is a wasteful number, since it uses less digits than its factorization.

64644841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 228710.

The product of its digits is 73728, while the sum is 37.

The square root of 64644841 is about 8040.2015522000. The cubic root of 64644841 is about 401.3389319027.

The spelling of 64644841 in words is "sixty-four million, six hundred forty-four thousand, eight hundred forty-one".