64021873 has 4 divisors (see below), whose sum is σ = 64451700. Its totient is φ = 63592048.

The previous prime is 64021861. The next prime is 64021901. The reversal of 64021873 is 37812046.

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 2053489 + 61968384 = 1433^2 + 7872^2 .

It is a cyclic number.

It is not a de Polignac number, because 64021873 - 2⁹ = 64021361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64051873) 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, 214690 + ... + 214987.

It is an arithmetic number, because the mean of its divisors is an integer number (16112925).

Almost surely, 2^64021873 is an apocalyptic number.

It is an amenable number.

64021873 is a deficient number, since it is larger than the sum of its proper divisors (429827).

64021873 is a wasteful number, since it uses less digits than its factorization.

64021873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429826.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 64021873 is about 8001.3669457162. The cubic root of 64021873 is about 400.0455635597.

The spelling of 64021873 in words is "sixty-four million, twenty-one thousand, eight hundred seventy-three".