78531613587 has 32 divisors (see below), whose sum is σ = 133320168960. Its totient is φ = 44754858720.

The previous prime is 78531613583. The next prime is 78531613603.

78531613587 is a `hidden beast` number, since 7 + 8 + 53 + 1 + 6 + 1 + 3 + 587 = 666.

78531613587 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78531613587 - 2² = 78531613583 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78531613583) 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 31 ways as a sum of consecutive naturals, for example, 486489 + ... + 627482.

It is an arithmetic number, because the mean of its divisors is an integer number (4166255280).

Almost surely, 2^78531613587 is an apocalyptic number.

78531613587 is a deficient number, since it is larger than the sum of its proper divisors (54788555373).

78531613587 is a wasteful number, since it uses less digits than its factorization.

78531613587 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1114360 (or 1114354 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 54.

The spelling of 78531613587 in words is "seventy-eight billion, five hundred thirty-one million, six hundred thirteen thousand, five hundred eighty-seven".