64433081 has 4 divisors (see below), whose sum is σ = 64594164. Its totient is φ = 64272000.

The previous prime is 64433071. The next prime is 64433087. The reversal of 64433081 is 18033446.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 57229225 + 7203856 = 7565^2 + 2684^2 .

It is a cyclic number.

It is not a de Polignac number, because 64433081 - 2¹⁴ = 64416697 is a prime.

It is a super-2 number, since 2×64433081² = 8303243854305122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64433087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 79940 + ... + 80741.

It is an arithmetic number, because the mean of its divisors is an integer number (16148541).

Almost surely, 2^64433081 is an apocalyptic number.

It is an amenable number.

64433081 is a deficient number, since it is larger than the sum of its proper divisors (161083).

64433081 is a wasteful number, since it uses less digits than its factorization.

64433081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161082.

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 64433081 is about 8027.0219259698. The cubic root of 64433081 is about 400.9002245528.

The spelling of 64433081 in words is "sixty-four million, four hundred thirty-three thousand, eighty-one".