78627841 has 4 divisors (see below), whose sum is σ = 79916884. Its totient is φ = 77338800.

The previous prime is 78627827. The next prime is 78627853. The reversal of 78627841 is 14872687.

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

It can be written as a sum of positive squares in 2 ways, for example, as 42627841 + 36000000 = 6529^2 + 6000^2 .

It is a cyclic number.

It is not a de Polignac number, because 78627841 - 2²³ = 70239233 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78627541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 644430 + ... + 644551.

It is an arithmetic number, because the mean of its divisors is an integer number (19979221).

Almost surely, 2^78627841 is an apocalyptic number.

78627841 is the 5120-th hex number.

It is an amenable number.

78627841 is a deficient number, since it is larger than the sum of its proper divisors (1289043).

78627841 is a wasteful number, since it uses less digits than its factorization.

78627841 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1289042.

The product of its digits is 150528, while the sum is 43.

The square root of 78627841 is about 8867.2341234457. The cubic root of 78627841 is about 428.4091950130.

The spelling of 78627841 in words is "seventy-eight million, six hundred twenty-seven thousand, eight hundred forty-one".