85580781 has 16 divisors (see below), whose sum is σ = 134057280. Its totient is φ = 47877120.

The previous prime is 85580777. The next prime is 85580783. The reversal of 85580781 is 18708558.

It is not a de Polignac number, because 85580781 - 2² = 85580777 is a prime.

It is a super-2 number, since 2×85580781² = 14648140153139922, 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 (85580783) 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 15 ways as a sum of consecutive naturals, for example, 99316 + ... + 100173.

It is an arithmetic number, because the mean of its divisors is an integer number (8378580).

Almost surely, 2^85580781 is an apocalyptic number.

It is an amenable number.

85580781 is a deficient number, since it is larger than the sum of its proper divisors (48476499).

85580781 is a wasteful number, since it uses less digits than its factorization.

85580781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199516.

The product of its (nonzero) digits is 89600, while the sum is 42.

The square root of 85580781 is about 9250.9881093859. The cubic root of 85580781 is about 440.6821049071.

The spelling of 85580781 in words is "eighty-five million, five hundred eighty thousand, seven hundred eighty-one".