64438445 has 8 divisors (see below), whose sum is σ = 77402520. Its totient is φ = 51499840.

The previous prime is 64438417. The next prime is 64438469. The reversal of 64438445 is 54483446.

It can be written as a sum of positive squares in 4 ways, for example, as 4313929 + 60124516 = 2077^2 + 7754^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 64438445 - 2⁸ = 64438189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 64438399 and 64438408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 266 + ... + 11355.

It is an arithmetic number, because the mean of its divisors is an integer number (9675315).

Almost surely, 2^64438445 is an apocalyptic number.

It is an amenable number.

64438445 is a deficient number, since it is larger than the sum of its proper divisors (12964075).

64438445 is a wasteful number, since it uses less digits than its factorization.

64438445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12735.

The product of its digits is 184320, while the sum is 38.

The square root of 64438445 is about 8027.3560404407. The cubic root of 64438445 is about 400.9113491134.

The spelling of 64438445 in words is "sixty-four million, four hundred thirty-eight thousand, four hundred forty-five".