64489919 has 4 divisors (see below), whose sum is σ = 69450696. Its totient is φ = 59529144.

The previous prime is 64489903. The next prime is 64489937. The reversal of 64489919 is 91998446.

It is a happy number.

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 64489919 - 2⁴ = 64489903 is a prime.

It is a super-2 number, since 2×64489919² = 8317899305253122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64489949) 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, 2480369 + ... + 2480394.

It is an arithmetic number, because the mean of its divisors is an integer number (17362674).

Almost surely, 2^64489919 is an apocalyptic number.

64489919 is a deficient number, since it is larger than the sum of its proper divisors (4960777).

64489919 is a wasteful number, since it uses less digits than its factorization.

64489919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4960776.

The product of its digits is 559872, while the sum is 50.

The square root of 64489919 is about 8030.5615619333. The cubic root of 64489919 is about 401.0180712125.

The spelling of 64489919 in words is "sixty-four million, four hundred eighty-nine thousand, nine hundred nineteen".