78846091 has 4 divisors (see below), whose sum is σ = 78886800. Its totient is φ = 78805384.

The previous prime is 78846083. The next prime is 78846101. The reversal of 78846091 is 19064887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19064887 = 167 ⋅114161.

It is a cyclic number.

It is not a de Polignac number, because 78846091 - 2³ = 78846083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78846011) 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, 17296 + ... + 21373.

It is an arithmetic number, because the mean of its divisors is an integer number (19721700).

Almost surely, 2^78846091 is an apocalyptic number.

78846091 is a deficient number, since it is larger than the sum of its proper divisors (40709).

78846091 is a wasteful number, since it uses less digits than its factorization.

78846091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40708.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 78846091 is about 8879.5321385758. The cubic root of 78846091 is about 428.8052122003.

The spelling of 78846091 in words is "seventy-eight million, eight hundred forty-six thousand, ninety-one".