78061198 has 4 divisors (see below), whose sum is σ = 117091800. Its totient is φ = 39030598.

The previous prime is 78061187. The next prime is 78061199. The reversal of 78061198 is 89116087.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 78061198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78061199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19515298 + ... + 19515301.

It is an arithmetic number, because the mean of its divisors is an integer number (29272950).

Almost surely, 2^78061198 is an apocalyptic number.

78061198 is a deficient number, since it is larger than the sum of its proper divisors (39030602).

78061198 is a wasteful number, since it uses less digits than its factorization.

78061198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39030601.

The product of its (nonzero) digits is 24192, while the sum is 40.

The square root of 78061198 is about 8835.2248415080. The cubic root of 78061198 is about 427.3775817644.

The spelling of 78061198 in words is "seventy-eight million, sixty-one thousand, one hundred ninety-eight".