85406505 has 16 divisors (see below), whose sum is σ = 138382080. Its totient is φ = 44972928.

The previous prime is 85406491. The next prime is 85406507. The reversal of 85406505 is 50560458.

It is not a de Polignac number, because 85406505 - 2¹² = 85402409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85406507) 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, 34852 + ... + 37221.

It is an arithmetic number, because the mean of its divisors is an integer number (8648880).

Almost surely, 2^85406505 is an apocalyptic number.

It is an amenable number.

85406505 is a deficient number, since it is larger than the sum of its proper divisors (52975575).

85406505 is a wasteful number, since it uses less digits than its factorization.

85406505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72160.

The product of its (nonzero) digits is 24000, while the sum is 33.

The square root of 85406505 is about 9241.5639910136. The cubic root of 85406505 is about 440.3827678188.

The spelling of 85406505 in words is "eighty-five million, four hundred six thousand, five hundred five".