78771841 has 4 divisors (see below), whose sum is σ = 79062784. Its totient is φ = 78480900.

The previous prime is 78771839. The next prime is 78771881. The reversal of 78771841 is 14817787.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78771841 - 2¹ = 78771839 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78771821) 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, 145065 + ... + 145606.

It is an arithmetic number, because the mean of its divisors is an integer number (19765696).

Almost surely, 2^78771841 is an apocalyptic number.

It is an amenable number.

78771841 is a deficient number, since it is larger than the sum of its proper divisors (290943).

78771841 is a wasteful number, since it uses less digits than its factorization.

78771841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290942.

The product of its digits is 87808, while the sum is 43.

The square root of 78771841 is about 8875.3501902742. The cubic root of 78771841 is about 428.6705668166.

The spelling of 78771841 in words is "seventy-eight million, seven hundred seventy-one thousand, eight hundred forty-one".