64021445 has 4 divisors (see below), whose sum is σ = 76825740. Its totient is φ = 51217152.

The previous prime is 64021423. The next prime is 64021457. The reversal of 64021445 is 54412046.

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 37540129 + 26481316 = 6127^2 + 5146^2 .

It is a cyclic number.

It is not a de Polignac number, because 64021445 - 2⁸ = 64021189 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6402140 + ... + 6402149.

It is an arithmetic number, because the mean of its divisors is an integer number (19206435).

Almost surely, 2^64021445 is an apocalyptic number.

It is an amenable number.

64021445 is a deficient number, since it is larger than the sum of its proper divisors (12804295).

64021445 is a wasteful number, since it uses less digits than its factorization.

64021445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12804294.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 64021445 is about 8001.3402002415. The cubic root of 64021445 is about 400.0446720942.

The spelling of 64021445 in words is "sixty-four million, twenty-one thousand, four hundred forty-five".