197878424878790 has 16 divisors (see below), whose sum is σ = 367670879775360. Its totient is φ = 76598099952960.

The previous prime is 197878424878703. The next prime is 197878424878807. The reversal of 197878424878790 is 97878424878791.

It is a junction number, because it is equal to n+sod(n) for n = 197878424878696 and 197878424878705.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 319158749495 + ... + 319158750114.

It is an arithmetic number, because the mean of its divisors is an integer number (22979429985960).

Almost surely, 2^{197878424878790} is an apocalyptic number.

197878424878790 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

197878424878790 is a deficient number, since it is larger than the sum of its proper divisors (169792454896570).

197878424878790 is a wasteful number, since it uses less digits than its factorization.

197878424878790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 638317499647.

The product of its (nonzero) digits is 25491013632, while the sum is 89.

Subtracting from 197878424878790 its reverse (97878424878791), we obtain a palindrome (99999999999999).

The spelling of 197878424878790 in words is "one hundred ninety-seven trillion, eight hundred seventy-eight billion, four hundred twenty-four million, eight hundred seventy-eight thousand, seven hundred ninety".