78324191 has 4 divisors (see below), whose sum is σ = 85444584. Its totient is φ = 71203800.

The previous prime is 78324179. The next prime is 78324217. The reversal of 78324191 is 19142387.

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

It is a cyclic number.

It is not a de Polignac number, because 78324191 - 2²⁶ = 11215327 is a prime.

It is a super-2 number, since 2×78324191² = 12269357791608962, 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 (78324101) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3560180 + ... + 3560201.

It is an arithmetic number, because the mean of its divisors is an integer number (21361146).

Almost surely, 2^78324191 is an apocalyptic number.

78324191 is a deficient number, since it is larger than the sum of its proper divisors (7120393).

78324191 is a wasteful number, since it uses less digits than its factorization.

78324191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7120392.

The product of its digits is 12096, while the sum is 35.

The square root of 78324191 is about 8850.0955362075. The cubic root of 78324191 is about 427.8569976008.

The spelling of 78324191 in words is "seventy-eight million, three hundred twenty-four thousand, one hundred ninety-one".