85708719987 has 64 divisors (see below), whose sum is σ = 136991347200. Its totient is φ = 47051540480.

The previous prime is 85708719977. The next prime is 85708719991. The reversal of 85708719987 is 78991780758.

It is a cyclic number.

It is not a de Polignac number, because 85708719987 - 2⁶ = 85708719923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85708719907) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5148964 + ... + 5165582.

It is an arithmetic number, because the mean of its divisors is an integer number (2140489800).

Almost surely, 2^85708719987 is an apocalyptic number.

85708719987 is a gapful number since it is divisible by the number (87) formed by its first and last digit.

85708719987 is a deficient number, since it is larger than the sum of its proper divisors (51282627213).

85708719987 is a wasteful number, since it uses less digits than its factorization.

85708719987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16996.

The product of its (nonzero) digits is 71124480, while the sum is 69.

It can be divided in two parts, 8570871 and 9987, that added together give a palindrome (8580858).

The spelling of 85708719987 in words is "eighty-five billion, seven hundred eight million, seven hundred nineteen thousand, nine hundred eighty-seven".