64242919 has 4 divisors (see below), whose sum is σ = 69184696. Its totient is φ = 59301144.

The previous prime is 64242901. The next prime is 64242929. The reversal of 64242919 is 91924246.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91924246 = 2 ⋅45962123.

It is a cyclic number.

It is not a de Polignac number, because 64242919 - 2⁷ = 64242791 is a prime.

It is a super-2 number, since 2×64242919² = 8254305283281122, 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 (64242929) 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, 2470869 + ... + 2470894.

It is an arithmetic number, because the mean of its divisors is an integer number (17296174).

Almost surely, 2^64242919 is an apocalyptic number.

64242919 is a deficient number, since it is larger than the sum of its proper divisors (4941777).

64242919 is a wasteful number, since it uses less digits than its factorization.

64242919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4941776.

The product of its digits is 31104, while the sum is 37.

The square root of 64242919 is about 8015.1680581258. The cubic root of 64242919 is about 400.5054423012.

The spelling of 64242919 in words is "sixty-four million, two hundred forty-two thousand, nine hundred nineteen".