78198197 has 8 divisors (see below), whose sum is σ = 97493952. Its totient is φ = 60933600.

The previous prime is 78198191. The next prime is 78198217. The reversal of 78198197 is 79189187.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78198197 - 2⁸ = 78197941 is a prime.

It is a super-2 number, since 2×78198197² = 12229916028101618, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78198191) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 507704 + ... + 507857.

It is an arithmetic number, because the mean of its divisors is an integer number (12186744).

Almost surely, 2^78198197 is an apocalyptic number.

78198197 is a gapful number since it is divisible by the number (77) formed by its first and last digit.

It is an amenable number.

78198197 is a deficient number, since it is larger than the sum of its proper divisors (19295755).

78198197 is a wasteful number, since it uses less digits than its factorization.

78198197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015579.

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

The square root of 78198197 is about 8842.9744430254. The cubic root of 78198197 is about 427.6274544449.

The spelling of 78198197 in words is "seventy-eight million, one hundred ninety-eight thousand, one hundred ninety-seven".