7798540857 has 4 divisors (see below), whose sum is σ = 10398054480. Its totient is φ = 5199027236.

The previous prime is 7798540843. The next prime is 7798540859. The reversal of 7798540857 is 7580458977.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 7798540857 - 2⁸ = 7798540601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7798540857.

It is not an unprimeable number, because it can be changed into a prime (7798540859) 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, 1299756807 + ... + 1299756812.

It is an arithmetic number, because the mean of its divisors is an integer number (2599513620).

Almost surely, 2^7798540857 is an apocalyptic number.

It is an amenable number.

7798540857 is a deficient number, since it is larger than the sum of its proper divisors (2599513623).

7798540857 is a wasteful number, since it uses less digits than its factorization.

7798540857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2599513622.

The product of its (nonzero) digits is 19756800, while the sum is 60.

The square root of 7798540857 is about 88309.3475063654. The cubic root of 7798540857 is about 1983.0688099503.

The spelling of 7798540857 in words is "seven billion, seven hundred ninety-eight million, five hundred forty thousand, eight hundred fifty-seven".