78889841 has 4 divisors (see below), whose sum is σ = 78909684. Its totient is φ = 78870000.

The previous prime is 78889817. The next prime is 78889847. The reversal of 78889841 is 14898887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 14898887 = 137 ⋅108751.

It can be written as a sum of positive squares in 2 ways, for example, as 39250225 + 39639616 = 6265^2 + 6296^2 .

It is a cyclic number.

It is not a de Polignac number, because 78889841 - 2⁶ = 78889777 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78889847) 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, 1670 + ... + 12671.

It is an arithmetic number, because the mean of its divisors is an integer number (19727421).

Almost surely, 2^78889841 is an apocalyptic number.

It is an amenable number.

78889841 is a deficient number, since it is larger than the sum of its proper divisors (19843).

78889841 is a wasteful number, since it uses less digits than its factorization.

78889841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19842.

The product of its digits is 1032192, while the sum is 53.

The square root of 78889841 is about 8881.9953276277. The cubic root of 78889841 is about 428.8845091318.

The spelling of 78889841 in words is "seventy-eight million, eight hundred eighty-nine thousand, eight hundred forty-one".