64449619 has 4 divisors (see below), whose sum is σ = 69407296. Its totient is φ = 59491944.

The previous prime is 64449607. The next prime is 64449641. The reversal of 64449619 is 91694446.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 64449619 - 2¹³ = 64441427 is a prime.

It is a super-2 number, since 2×64449619² = 8307506778490322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64449719) 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, 2478819 + ... + 2478844.

It is an arithmetic number, because the mean of its divisors is an integer number (17351824).

Almost surely, 2^64449619 is an apocalyptic number.

64449619 is a deficient number, since it is larger than the sum of its proper divisors (4957677).

64449619 is a wasteful number, since it uses less digits than its factorization.

64449619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4957676.

The product of its digits is 186624, while the sum is 43.

The square root of 64449619 is about 8028.0520053124. The cubic root of 64449619 is about 400.9345212249.

The spelling of 64449619 in words is "sixty-four million, four hundred forty-nine thousand, six hundred nineteen".