85781700 has 72 divisors (see below), whose sum is σ = 275780960. Its totient is φ = 22874400.

The previous prime is 85781687. The next prime is 85781701. The reversal of 85781700 is 718758.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (85781701) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13186 + ... + 18585.

Almost surely, 2^85781700 is an apocalyptic number.

It is an amenable number.

85781700 is an abundant number, since it is smaller than the sum of its proper divisors (189999260).

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

85781700 is a wasteful number, since it uses less digits than its factorization.

85781700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31794 (or 31781 counting only the distinct ones).

The product of its (nonzero) digits is 15680, while the sum is 36.

The square root of 85781700 is about 9261.8410696794. The cubic root of 85781700 is about 441.0267002206.

The spelling of 85781700 in words is "eighty-five million, seven hundred eighty-one thousand, seven hundred".