196991278 has 32 divisors (see below), whose sum is σ = 341671680. Its totient is φ = 84240000.

The previous prime is 196991273. The next prime is 196991317. The reversal of 196991278 is 872199691.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (196991273) 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, 61558 + ... + 64678.

It is an arithmetic number, because the mean of its divisors is an integer number (10677240).

Almost surely, 2^196991278 is an apocalyptic number.

196991278 is a deficient number, since it is larger than the sum of its proper divisors (144680402).

196991278 is a wasteful number, since it uses less digits than its factorization.

196991278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304.

The product of its digits is 489888, while the sum is 52.

The square root of 196991278 is about 14035.3581357940. The cubic root of 196991278 is about 581.8561994408.

The spelling of 196991278 in words is "one hundred ninety-six million, nine hundred ninety-one thousand, two hundred seventy-eight".