64618819 has 8 divisors (see below), whose sum is σ = 69711840. Its totient is φ = 59669376.

The previous prime is 64618811. The next prime is 64618847. The reversal of 64618819 is 91881646.

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 64618819 - 2³ = 64618811 is a prime.

It is a super-2 number, since 2×64618819² = 8351183537909522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (64618811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34959 + ... + 36760.

It is an arithmetic number, because the mean of its divisors is an integer number (8713980).

Almost surely, 2^64618819 is an apocalyptic number.

64618819 is a deficient number, since it is larger than the sum of its proper divisors (5093021).

64618819 is a wasteful number, since it uses less digits than its factorization.

64618819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71789.

The product of its digits is 82944, while the sum is 43.

The square root of 64618819 is about 8038.5831463013. The cubic root of 64618819 is about 401.2850732953.

The spelling of 64618819 in words is "sixty-four million, six hundred eighteen thousand, eight hundred nineteen".