85180781 has 8 divisors (see below), whose sum is σ = 102473280. Its totient is φ = 69169248.

The previous prime is 85180757. The next prime is 85180783. The reversal of 85180781 is 18708158.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 85180781 - 2²⁶ = 18071917 is a prime.

It is a super-2 number, since 2×85180781² = 14511530903539922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85180783) 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 7 ways as a sum of consecutive naturals, for example, 320096 + ... + 320361.

It is an arithmetic number, because the mean of its divisors is an integer number (12809160).

Almost surely, 2^85180781 is an apocalyptic number.

It is an amenable number.

85180781 is a deficient number, since it is larger than the sum of its proper divisors (17292499).

85180781 is a wasteful number, since it uses less digits than its factorization.

85180781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640483.

The product of its (nonzero) digits is 17920, while the sum is 38.

The square root of 85180781 is about 9229.3434761092. The cubic root of 85180781 is about 439.9944575748.

The spelling of 85180781 in words is "eighty-five million, one hundred eighty thousand, seven hundred eighty-one".