78216199 has 4 divisors (see below), whose sum is σ = 78345664. Its totient is φ = 78086736.

The previous prime is 78216197. The next prime is 78216283. The reversal of 78216199 is 99161287.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99161287 = 107 ⋅926741.

It is a cyclic number.

It is not a de Polignac number, because 78216199 - 2¹ = 78216197 is a prime.

It is a super-2 number, since 2×78216199² = 12235547572015202, 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 (78216197) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63822 + ... + 65035.

It is an arithmetic number, because the mean of its divisors is an integer number (19586416).

Almost surely, 2^78216199 is an apocalyptic number.

78216199 is a deficient number, since it is larger than the sum of its proper divisors (129465).

78216199 is a wasteful number, since it uses less digits than its factorization.

78216199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129464.

The product of its digits is 54432, while the sum is 43.

The square root of 78216199 is about 8843.9922546325. The cubic root of 78216199 is about 427.6602666199.

The spelling of 78216199 in words is "seventy-eight million, two hundred sixteen thousand, one hundred ninety-nine".