78681855 has 16 divisors (see below), whose sum is σ = 143875584. Its totient is φ = 35968800.

The previous prime is 78681853. The next prime is 78681857. The reversal of 78681855 is 55818687.

It is an interprime number because it is at equal distance from previous prime (78681853) and next prime (78681857).

It is not a de Polignac number, because 78681855 - 2¹ = 78681853 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78681851) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 374571 + ... + 374780.

It is an arithmetic number, because the mean of its divisors is an integer number (8992224).

Almost surely, 2^78681855 is an apocalyptic number.

78681855 is a deficient number, since it is larger than the sum of its proper divisors (65193729).

78681855 is a wasteful number, since it uses less digits than its factorization.

78681855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 749366.

The product of its digits is 537600, while the sum is 48.

The square root of 78681855 is about 8870.2793078910. The cubic root of 78681855 is about 428.5072722218.

The spelling of 78681855 in words is "seventy-eight million, six hundred eighty-one thousand, eight hundred fifty-five".