78618578285 has 16 divisors (see below), whose sum is σ = 102281281200. Its totient is φ = 57667146240.

The previous prime is 78618578281. The next prime is 78618578329. The reversal of 78618578285 is 58287581687.

It can be written as a sum of positive squares in 8 ways, for example, as 10241035204 + 68377543081 = 101198^2 + 261491^2 .

It is not a de Polignac number, because 78618578285 - 2² = 78618578281 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78618578281) 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, 4049096 + ... + 4068465.

It is an arithmetic number, because the mean of its divisors is an integer number (6392580075).

Almost surely, 2^78618578285 is an apocalyptic number.

It is an amenable number.

78618578285 is a deficient number, since it is larger than the sum of its proper divisors (23662702915).

78618578285 is a wasteful number, since it uses less digits than its factorization.

78618578285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8117728.

The product of its digits is 60211200, while the sum is 65.

The spelling of 78618578285 in words is "seventy-eight billion, six hundred eighteen million, five hundred seventy-eight thousand, two hundred eighty-five".