77875857878 has 72 divisors (see below), whose sum is σ = 154446439392. Its totient is φ = 29186383968.

The previous prime is 77875857869. The next prime is 77875857883. The reversal of 77875857878 is 87875857877.

It is a junction number, because it is equal to n+sod(n) for n = 77875857799 and 77875857808.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 375251 + ... + 544577.

It is an arithmetic number, because the mean of its divisors is an integer number (2145089436).

Almost surely, 2^77875857878 is an apocalyptic number.

77875857878 is a deficient number, since it is larger than the sum of its proper divisors (76570581514).

77875857878 is a wasteful number, since it uses less digits than its factorization.

77875857878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169394 (or 169368 counting only the distinct ones).

The product of its digits is 1721036800, while the sum is 77.

Subtracting 77875857878 from its reverse (87875857877), we obtain a palindrome (9999999999).

The spelling of 77875857878 in words is "seventy-seven billion, eight hundred seventy-five million, eight hundred fifty-seven thousand, eight hundred seventy-eight".