85172810 has 16 divisors (see below), whose sum is σ = 158257152. Its totient is φ = 32970000.

The previous prime is 85172783. The next prime is 85172819. The reversal of 85172810 is 1827158.

It is a happy number.

It is a super-2 number, since 2×85172810² = 14508815126592200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (85172819) by changing a digit.

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, 137066 + ... + 137685.

It is an arithmetic number, because the mean of its divisors is an integer number (9891072).

Almost surely, 2^85172810 is an apocalyptic number.

85172810 is a deficient number, since it is larger than the sum of its proper divisors (73084342).

85172810 is a wasteful number, since it uses less digits than its factorization.

85172810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274789.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 85172810 is about 9228.9116368075. The cubic root of 85172810 is about 439.9807326274.

Adding to 85172810 its reverse (1827158), we get a palindrome (86999968).

The spelling of 85172810 in words is "eighty-five million, one hundred seventy-two thousand, eight hundred ten".