64042919 has 4 divisors (see below), whose sum is σ = 64165896. Its totient is φ = 63919944.

The previous prime is 64042877. The next prime is 64042949. The reversal of 64042919 is 91924046.

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 64042919 - 2²⁰ = 62994343 is a prime.

It is a super-2 number, since 2×64042919² = 8202990948081122, 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 (64042949) 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, 60704 + ... + 61749.

It is an arithmetic number, because the mean of its divisors is an integer number (16041474).

Almost surely, 2^64042919 is an apocalyptic number.

64042919 is a deficient number, since it is larger than the sum of its proper divisors (122977).

64042919 is a wasteful number, since it uses less digits than its factorization.

64042919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122976.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 64042919 is about 8002.6819879338. The cubic root of 64042919 is about 400.0893946034.

The spelling of 64042919 in words is "sixty-four million, forty-two thousand, nine hundred nineteen".