64523819 has 8 divisors (see below), whose sum is σ = 66452880. Its totient is φ = 62604576.

The previous prime is 64523813. The next prime is 64523821. The reversal of 64523819 is 91832546.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64523819 is a prime.

It is a super-2 number, since 2×64523819² = 8326646436689522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64523813) 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, 12152 + ... + 16634.

It is an arithmetic number, because the mean of its divisors is an integer number (8306610).

Almost surely, 2^64523819 is an apocalyptic number.

64523819 is a deficient number, since it is larger than the sum of its proper divisors (1929061).

64523819 is a wasteful number, since it uses less digits than its factorization.

64523819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4909.

The product of its digits is 51840, while the sum is 38.

The square root of 64523819 is about 8032.6719713928. The cubic root of 64523819 is about 401.0883257653.

The spelling of 64523819 in words is "sixty-four million, five hundred twenty-three thousand, eight hundred nineteen".