64442089 has 4 divisors (see below), whose sum is σ = 66664260. Its totient is φ = 62219920.

The previous prime is 64442071. The next prime is 64442099. The reversal of 64442089 is 98024446.

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 39790864 + 24651225 = 6308^2 + 4965^2 .

It is a cyclic number.

It is not a de Polignac number, because 64442089 - 2⁷ = 64441961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64442009) 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, 1111042 + ... + 1111099.

It is an arithmetic number, because the mean of its divisors is an integer number (16666065).

Almost surely, 2^64442089 is an apocalyptic number.

It is an amenable number.

64442089 is a deficient number, since it is larger than the sum of its proper divisors (2222171).

64442089 is a wasteful number, since it uses less digits than its factorization.

64442089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222170.

The product of its (nonzero) digits is 55296, while the sum is 37.

The square root of 64442089 is about 8027.5830110937. The cubic root of 64442089 is about 400.9189061622.

The spelling of 64442089 in words is "sixty-four million, four hundred forty-two thousand, eighty-nine".