7857772894 has 16 divisors (see below), whose sum is σ = 12215682720. Its totient is φ = 3786380640.

The previous prime is 7857772873. The next prime is 7857772939. The reversal of 7857772894 is 4982777587.

7857772894 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×7857772894² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 93834 + ... + 156589.

It is an arithmetic number, because the mean of its divisors is an integer number (763480170).

Almost surely, 2^7857772894 is an apocalyptic number.

7857772894 is a deficient number, since it is larger than the sum of its proper divisors (4357909826).

7857772894 is a wasteful number, since it uses less digits than its factorization.

7857772894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250995.

The product of its digits is 55319040, while the sum is 64.

The square root of 7857772894 is about 88644.0798587249. The cubic root of 7857772894 is about 1988.0768010833.

The spelling of 7857772894 in words is "seven billion, eight hundred fifty-seven million, seven hundred seventy-two thousand, eight hundred ninety-four".