85907781988 has 24 divisors (see below), whose sum is σ = 179285807232. Its totient is φ = 35216854464.

The previous prime is 85907781977. The next prime is 85907782013. The reversal of 85907781988 is 88918770958.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66697945 + ... + 66699232.

It is an arithmetic number, because the mean of its divisors is an integer number (7470241968).

Almost surely, 2^85907781988 is an apocalyptic number.

It is an amenable number.

85907781988 is an abundant number, since it is smaller than the sum of its proper divisors (93378025244).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85907781988 is a wasteful number, since it uses less digits than its factorization.

85907781988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133397211 (or 133397209 counting only the distinct ones).

The product of its (nonzero) digits is 81285120, while the sum is 70.

The spelling of 85907781988 in words is "eighty-five billion, nine hundred seven million, seven hundred eighty-one thousand, nine hundred eighty-eight".