64440041 has 4 divisors (see below), whose sum is σ = 66518784. Its totient is φ = 62361300.

The previous prime is 64440029. The next prime is 64440049. The reversal of 64440041 is 14004446.

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: 14004446 = 2 ⋅7002223.

It is a cyclic number.

It is not a de Polignac number, because 64440041 - 2¹⁴ = 64423657 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 64439989 and 64440016.

It is not an unprimeable number, because it can be changed into a prime (64440049) 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, 1039325 + ... + 1039386.

It is an arithmetic number, because the mean of its divisors is an integer number (16629696).

Almost surely, 2^64440041 is an apocalyptic number.

It is an amenable number.

64440041 is a deficient number, since it is larger than the sum of its proper divisors (2078743).

64440041 is a wasteful number, since it uses less digits than its factorization.

64440041 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2078742.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 64440041 is about 8027.4554498920. The cubic root of 64440041 is about 400.9146589865.

Adding to 64440041 its reverse (14004446), we get a palindrome (78444487).

The spelling of 64440041 in words is "sixty-four million, four hundred forty thousand, forty-one".