64021145 has 4 divisors (see below), whose sum is σ = 76825380. Its totient is φ = 51216912.

The previous prime is 64021129. The next prime is 64021187. The reversal of 64021145 is 54112046.

64021145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 39300361 + 24720784 = 6269^2 + 4972^2 .

It is a cyclic number.

It is not a de Polignac number, because 64021145 - 2⁴ = 64021129 is a prime.

It is a super-2 number, since 2×64021145² = 8197414014222050, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 64021145.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6402110 + ... + 6402119.

It is an arithmetic number, because the mean of its divisors is an integer number (19206345).

Almost surely, 2^64021145 is an apocalyptic number.

It is an amenable number.

64021145 is a deficient number, since it is larger than the sum of its proper divisors (12804235).

64021145 is a wasteful number, since it uses less digits than its factorization.

64021145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12804234.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 64021145 is about 8001.3214533601. The cubic root of 64021145 is about 400.0440472328.

Subtracting from 64021145 its reverse (54112046), we obtain a palindrome (9909099).

The spelling of 64021145 in words is "sixty-four million, twenty-one thousand, one hundred forty-five".