7864198213 has 4 divisors (see below), whose sum is σ = 7904945548. Its totient is φ = 7823450880.

The previous prime is 7864198193. The next prime is 7864198219. The reversal of 7864198213 is 3128914687.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3128914687 = 23 ⋅136039769.

It can be written as a sum of positive squares in 2 ways, for example, as 4847222884 + 3016975329 = 69622^2 + 54927^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7864198213 is a prime.

It is a super-2 number, since 2×7864198213² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7864198219) 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, 20373378 + ... + 20373763.

It is an arithmetic number, because the mean of its divisors is an integer number (1976236387).

Almost surely, 2^7864198213 is an apocalyptic number.

It is an amenable number.

7864198213 is a deficient number, since it is larger than the sum of its proper divisors (40747335).

7864198213 is a wasteful number, since it uses less digits than its factorization.

7864198213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40747334.

The product of its digits is 580608, while the sum is 49.

The square root of 7864198213 is about 88680.3146870826. The cubic root of 7864198213 is about 1988.6185384438.

The spelling of 7864198213 in words is "seven billion, eight hundred sixty-four million, one hundred ninety-eight thousand, two hundred thirteen".