7427778813 has 224 divisors, whose sum is σ = 14807439360. Its totient is φ = 3615373440.

The previous prime is 7427778797. The next prime is 7427778829. The reversal of 7427778813 is 3188777247.

It is an interprime number because it is at equal distance from previous prime (7427778797) and next prime (7427778829).

It is not a de Polignac number, because 7427778813 - 2⁴ = 7427778797 is a prime.

Its product of digits (3687936) is a multiple of the sum of its prime divisors (196).

It is a self number, because there is not a number n which added to its sum of digits gives 7427778813.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7427778013) by changing a digit.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 89491270 + ... + 89491352.

It is an arithmetic number, because the mean of its divisors is an integer number (66104640).

Almost surely, 2^7427778813 is an apocalyptic number.

It is an amenable number.

7427778813 is a deficient number, since it is larger than the sum of its proper divisors (7379660547).

7427778813 is a wasteful number, since it uses less digits than its factorization.

7427778813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 211 (or 196 counting only the distinct ones).

The product of its digits is 3687936, while the sum is 54.

The square root of 7427778813 is about 86184.5624981644. The cubic root of 7427778813 is about 1951.1305136881.

The spelling of 7427778813 in words is "seven billion, four hundred twenty-seven million, seven hundred seventy-eight thousand, eight hundred thirteen".