64406443 has 4 divisors (see below), whose sum is σ = 65313648. Its totient is φ = 63499240.

The previous prime is 64406413. The next prime is 64406453. The reversal of 64406443 is 34460446.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34460446 = 2 ⋅17230223.

It is a cyclic number.

It is not a de Polignac number, because 64406443 - 2⁵ = 64406411 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64406413) 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, 453496 + ... + 453637.

It is an arithmetic number, because the mean of its divisors is an integer number (16328412).

Almost surely, 2^64406443 is an apocalyptic number.

64406443 is a deficient number, since it is larger than the sum of its proper divisors (907205).

64406443 is an equidigital number, since it uses as much as digits as its factorization.

64406443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 907204.

The product of its (nonzero) digits is 27648, while the sum is 31.

The square root of 64406443 is about 8025.3624840253. The cubic root of 64406443 is about 400.8449700572.

Adding to 64406443 its reverse (34460446), we get a palindrome (98866889).

The spelling of 64406443 in words is "sixty-four million, four hundred six thousand, four hundred forty-three".