78879897887 has 16 divisors (see below), whose sum is σ = 94911075840. Its totient is φ = 64040722848.

The previous prime is 78879897857. The next prime is 78879897907.

78879897887 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 78879897887 - 2¹² = 78879893791 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78879897799 and 78879897808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78879897857) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 685718 + ... + 792444.

It is an arithmetic number, because the mean of its divisors is an integer number (5931942240).

Almost surely, 2^78879897887 is an apocalyptic number.

78879897887 is a deficient number, since it is larger than the sum of its proper divisors (16031177953).

78879897887 is a wasteful number, since it uses less digits than its factorization.

78879897887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112310.

The product of its digits is 6372753408, while the sum is 86.

The spelling of 78879897887 in words is "seventy-eight billion, eight hundred seventy-nine million, eight hundred ninety-seven thousand, eight hundred eighty-seven".