878320207791 has 96 divisors (see below), whose sum is σ = 1407219876608. Its totient is φ = 524577669120.

The previous prime is 878320207753. The next prime is 878320207819. The reversal of 878320207791 is 197702023878.

It is not a de Polignac number, because 878320207791 - 2¹⁹ = 878319683503 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (878320207291) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 254068335 + ... + 254071791.

Almost surely, 2^878320207791 is an apocalyptic number.

878320207791 is a deficient number, since it is larger than the sum of its proper divisors (528899668817).

878320207791 is a wasteful number, since it uses less digits than its factorization.

878320207791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4001 (or 3998 counting only the distinct ones).

The product of its (nonzero) digits is 2370816, while the sum is 54.

The spelling of 878320207791 in words is "eight hundred seventy-eight billion, three hundred twenty million, two hundred seven thousand, seven hundred ninety-one".