64441385 has 4 divisors (see below), whose sum is σ = 77329668. Its totient is φ = 51553104.

The previous prime is 64441357. The next prime is 64441387. The reversal of 64441385 is 58314446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58314446 = 2 ⋅29157223.

It can be written as a sum of positive squares in 2 ways, for example, as 6635776 + 57805609 = 2576^2 + 7603^2 .

It is a cyclic number.

It is not a de Polignac number, because 64441385 - 2¹⁶ = 64375849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64441387) 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, 6444134 + ... + 6444143.

It is an arithmetic number, because the mean of its divisors is an integer number (19332417).

Almost surely, 2^64441385 is an apocalyptic number.

It is an amenable number.

64441385 is a deficient number, since it is larger than the sum of its proper divisors (12888283).

64441385 is a wasteful number, since it uses less digits than its factorization.

64441385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12888282.

The product of its digits is 46080, while the sum is 35.

The square root of 64441385 is about 8027.5391621592. The cubic root of 64441385 is about 400.9174462057.

The spelling of 64441385 in words is "sixty-four million, four hundred forty-one thousand, three hundred eighty-five".