64690519 has 4 divisors (see below), whose sum is σ = 65284120. Its totient is φ = 64096920.

The previous prime is 64690511. The next prime is 64690531. The reversal of 64690519 is 91509646.

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 64690519 - 2³ = 64690511 is a prime.

It is a super-2 number, since 2×64690519² = 8369726496978722, 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 (64690511) 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, 296637 + ... + 296854.

It is an arithmetic number, because the mean of its divisors is an integer number (16321030).

Almost surely, 2^64690519 is an apocalyptic number.

64690519 is a deficient number, since it is larger than the sum of its proper divisors (593601).

64690519 is a wasteful number, since it uses less digits than its factorization.

64690519 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 593600.

The product of its (nonzero) digits is 58320, while the sum is 40.

The square root of 64690519 is about 8043.0416510174. The cubic root of 64690519 is about 401.4334382508.

The spelling of 64690519 in words is "sixty-four million, six hundred ninety thousand, five hundred nineteen".