78781871 has 8 divisors (see below), whose sum is σ = 90266400. Its totient is φ = 67354848.

The previous prime is 78781867. The next prime is 78781873. The reversal of 78781871 is 17818787.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78781871 - 2² = 78781867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78781873) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11396 + ... + 16953.

It is an arithmetic number, because the mean of its divisors is an integer number (11283300).

Almost surely, 2^78781871 is an apocalyptic number.

78781871 is a deficient number, since it is larger than the sum of its proper divisors (11484529).

78781871 is a wasteful number, since it uses less digits than its factorization.

78781871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28753.

The product of its digits is 175616, while the sum is 47.

The square root of 78781871 is about 8875.9152204153. The cubic root of 78781871 is about 428.6887602186.

It can be divided in two parts, 7 and 8781871, that added together give a palindrome (8781878).

The spelling of 78781871 in words is "seventy-eight million, seven hundred eighty-one thousand, eight hundred seventy-one".