78587645373 has 12 divisors (see below), whose sum is σ = 120192869628. Its totient is φ = 49309895040.

The previous prime is 78587645371. The next prime is 78587645393. The reversal of 78587645373 is 37354678587.

78587645373 is a `hidden beast` number, since 7 + 8 + 587 + 6 + 45 + 3 + 7 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 55978613604 + 22609031769 = 236598^2 + 150363^2 .

It is not a de Polignac number, because 78587645373 - 2¹ = 78587645371 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78587645373.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78587645371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 256822218 + ... + 256822523.

It is an arithmetic number, because the mean of its divisors is an integer number (10016072469).

Almost surely, 2^78587645373 is an apocalyptic number.

It is an amenable number.

78587645373 is a deficient number, since it is larger than the sum of its proper divisors (41605224255).

78587645373 is a wasteful number, since it uses less digits than its factorization.

78587645373 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513644764 (or 513644761 counting only the distinct ones).

The product of its digits is 118540800, while the sum is 63.

The spelling of 78587645373 in words is "seventy-eight billion, five hundred eighty-seven million, six hundred forty-five thousand, three hundred seventy-three".