7897644818 has 8 divisors (see below), whose sum is σ = 13538819712. Its totient is φ = 3384704916.

The previous prime is 7897644739. The next prime is 7897644841. The reversal of 7897644818 is 8184467987.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 282058730 + ... + 282058757.

It is an arithmetic number, because the mean of its divisors is an integer number (1692352464).

Almost surely, 2^7897644818 is an apocalyptic number.

7897644818 is a deficient number, since it is larger than the sum of its proper divisors (5641174894).

7897644818 is a wasteful number, since it uses less digits than its factorization.

7897644818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564117496.

The product of its digits is 21676032, while the sum is 62.

The square root of 7897644818 is about 88868.6942516880. The cubic root of 7897644818 is about 1991.4337636805.

The spelling of 7897644818 in words is "seven billion, eight hundred ninety-seven million, six hundred forty-four thousand, eight hundred eighteen".