85561810 has 8 divisors (see below), whose sum is σ = 154011276. Its totient is φ = 34224720.

The previous prime is 85561789. The next prime is 85561849. The reversal of 85561810 is 1816558.

It can be written as a sum of positive squares in 2 ways, for example, as 84327489 + 1234321 = 9183^2 + 1111^2 .

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

It is a super-2 number, since 2×85561810² = 14641646660952200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4278081 + ... + 4278100.

Almost surely, 2^85561810 is an apocalyptic number.

85561810 is a deficient number, since it is larger than the sum of its proper divisors (68449466).

85561810 is a wasteful number, since it uses less digits than its factorization.

85561810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8556188.

The product of its (nonzero) digits is 9600, while the sum is 34.

The square root of 85561810 is about 9249.9627026275. The cubic root of 85561810 is about 440.6495399709.

The spelling of 85561810 in words is "eighty-five million, five hundred sixty-one thousand, eight hundred ten".