90256173 has 16 divisors (see below), whose sum is σ = 138448896. Its totient is φ = 51231600.

The previous prime is 90256139. The next prime is 90256181. The reversal of 90256173 is 37165209.

It is not a de Polignac number, because 90256173 - 2¹² = 90252077 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90256073) 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 15 ways as a sum of consecutive naturals, for example, 11061 + ... + 17402.

It is an arithmetic number, because the mean of its divisors is an integer number (8653056).

Almost surely, 2^90256173 is an apocalyptic number.

It is an amenable number.

90256173 is a deficient number, since it is larger than the sum of its proper divisors (48192723).

90256173 is a wasteful number, since it uses less digits than its factorization.

90256173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28624.

The product of its (nonzero) digits is 11340, while the sum is 33.

The square root of 90256173 is about 9500.3248891814. The cubic root of 90256173 is about 448.5652625792.

It can be divided in two parts, 902 and 56173, that added together give a palindrome (57075).

The spelling of 90256173 in words is "ninety million, two hundred fifty-six thousand, one hundred seventy-three".