78857655 has 16 divisors (see below), whose sum is σ = 126282624. Its totient is φ = 42020640.

The previous prime is 78857651. The next prime is 78857659. The reversal of 78857655 is 55675887.

It is an interprime number because it is at equal distance from previous prime (78857651) and next prime (78857659).

It is not a de Polignac number, because 78857655 - 2² = 78857651 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78857598 and 78857607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78857651) 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, 30732 + ... + 33198.

It is an arithmetic number, because the mean of its divisors is an integer number (7892664).

Almost surely, 2^78857655 is an apocalyptic number.

78857655 is a deficient number, since it is larger than the sum of its proper divisors (47424969).

78857655 is a wasteful number, since it uses less digits than its factorization.

78857655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4606.

The product of its digits is 2352000, while the sum is 51.

The square root of 78857655 is about 8880.1832751357. The cubic root of 78857655 is about 428.8261748167.

The spelling of 78857655 in words is "seventy-eight million, eight hundred fifty-seven thousand, six hundred fifty-five".