819998645 has 8 divisors (see below), whose sum is σ = 1026781056. Its totient is φ = 627477136.

The previous prime is 819998629. The next prime is 819998651. The reversal of 819998645 is 546899918.

819998645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 819998645 - 2⁴ = 819998629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3565097 + ... + 3565326.

It is an arithmetic number, because the mean of its divisors is an integer number (128347632).

Almost surely, 2^819998645 is an apocalyptic number.

It is an amenable number.

819998645 is a deficient number, since it is larger than the sum of its proper divisors (206782411).

819998645 is a wasteful number, since it uses less digits than its factorization.

819998645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7130451.

The product of its digits is 5598720, while the sum is 59.

The square root of 819998645 is about 28635.6184672167. The cubic root of 819998645 is about 935.9896467583.

The spelling of 819998645 in words is "eight hundred nineteen million, nine hundred ninety-eight thousand, six hundred forty-five".