78891197 has 16 divisors (see below), whose sum is σ = 100649472. Its totient is φ = 60041520.

The previous prime is 78891193. The next prime is 78891209. The reversal of 78891197 is 79119887.

It is not a de Polignac number, because 78891197 - 2² = 78891193 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78891191) 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, 8603 + ... + 15224.

It is an arithmetic number, because the mean of its divisors is an integer number (6290592).

Almost surely, 2^78891197 is an apocalyptic number.

78891197 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

78891197 is a deficient number, since it is larger than the sum of its proper divisors (21758275).

78891197 is a wasteful number, since it uses less digits than its factorization.

78891197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23888.

The product of its digits is 254016, while the sum is 50.

The square root of 78891197 is about 8882.0716614988. The cubic root of 78891197 is about 428.8869664150.

The spelling of 78891197 in words is "seventy-eight million, eight hundred ninety-one thousand, one hundred ninety-seven".