64739919 has 8 divisors (see below), whose sum is σ = 89296560. Its totient is φ = 41671616.

The previous prime is 64739881. The next prime is 64739921. The reversal of 64739919 is 91993746.

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

It is a cyclic number.

It is not a de Polignac number, because 64739919 - 2¹⁶ = 64674383 is a prime.

It is a super-2 number, since 2×64739919² = 8382514224253122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64739989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371982 + ... + 372155.

It is an arithmetic number, because the mean of its divisors is an integer number (11162070).

Almost surely, 2^64739919 is an apocalyptic number.

64739919 is a deficient number, since it is larger than the sum of its proper divisors (24556641).

64739919 is a wasteful number, since it uses less digits than its factorization.

64739919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 744169.

The product of its digits is 367416, while the sum is 48.

The square root of 64739919 is about 8046.1120424712. The cubic root of 64739919 is about 401.5355952410.

The spelling of 64739919 in words is "sixty-four million, seven hundred thirty-nine thousand, nine hundred nineteen".