7638818819 has 4 divisors (see below), whose sum is σ = 7641031944. Its totient is φ = 7636605696.

The previous prime is 7638818813. The next prime is 7638818849. The reversal of 7638818819 is 9188188367.

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 7638818819 - 2¹² = 7638814723 is a prime.

It is a super-2 number, since 2×7638818819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7638818813) 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, 1101377 + ... + 1108290.

It is an arithmetic number, because the mean of its divisors is an integer number (1910257986).

Almost surely, 2^7638818819 is an apocalyptic number.

7638818819 is a deficient number, since it is larger than the sum of its proper divisors (2213125).

7638818819 is a wasteful number, since it uses less digits than its factorization.

7638818819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2213124.

The product of its digits is 4644864, while the sum is 59.

The square root of 7638818819 is about 87400.3364924873. The cubic root of 7638818819 is about 1969.4368956683.

The spelling of 7638818819 in words is "seven billion, six hundred thirty-eight million, eight hundred eighteen thousand, eight hundred nineteen".