7838428279 has 6 divisors (see below), whose sum is σ = 8615793200. Its totient is φ = 7125843780.

The previous prime is 7838428277. The next prime is 7838428349. The reversal of 7838428279 is 9728248387.

It is a happy number.

It is not a de Polignac number, because 7838428279 - 2¹ = 7838428277 is a prime.

It is a super-2 number, since 2×7838428279² (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 (7838428277) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32390079 + ... + 32390320.

Almost surely, 2^7838428279 is an apocalyptic number.

7838428279 is a deficient number, since it is larger than the sum of its proper divisors (777364921).

7838428279 is a wasteful number, since it uses less digits than its factorization.

7838428279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64780421 (or 64780410 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 58.

The square root of 7838428279 is about 88534.8986501933. The cubic root of 7838428279 is about 1986.4440151466. Note that the first 3 decimals are identical.

The spelling of 7838428279 in words is "seven billion, eight hundred thirty-eight million, four hundred twenty-eight thousand, two hundred seventy-nine".