64640519 has 8 divisors (see below), whose sum is σ = 65454480. Its totient is φ = 63830656.

The previous prime is 64640503. The next prime is 64640539. The reversal of 64640519 is 91504646.

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 64640519 - 2⁴ = 64640503 is a prime.

It is a super-2 number, since 2×64640519² = 8356793393178722, 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 (64640539) 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, 40847 + ... + 42399.

It is an arithmetic number, because the mean of its divisors is an integer number (8181810).

Almost surely, 2^64640519 is an apocalyptic number.

64640519 is a deficient number, since it is larger than the sum of its proper divisors (813961).

64640519 is a wasteful number, since it uses less digits than its factorization.

64640519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2049.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 64640519 is about 8039.9327733508. The cubic root of 64640519 is about 401.3299875152.

The spelling of 64640519 in words is "sixty-four million, six hundred forty thousand, five hundred nineteen".