78844811 has 4 divisors (see below), whose sum is σ = 81388224. Its totient is φ = 76301400.

The previous prime is 78844807. The next prime is 78844841. The reversal of 78844811 is 11844887.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11844887 = 379 ⋅31253.

It is a cyclic number.

It is not a de Polignac number, because 78844811 - 2² = 78844807 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78844841) 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, 1271660 + ... + 1271721.

It is an arithmetic number, because the mean of its divisors is an integer number (20347056).

Almost surely, 2^78844811 is an apocalyptic number.

78844811 is a deficient number, since it is larger than the sum of its proper divisors (2543413).

78844811 is a wasteful number, since it uses less digits than its factorization.

78844811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2543412.

The product of its digits is 57344, while the sum is 41.

The square root of 78844811 is about 8879.4600624137. The cubic root of 78844811 is about 428.8028917570.

The spelling of 78844811 in words is "seventy-eight million, eight hundred forty-four thousand, eight hundred eleven".