97805985 has 16 divisors (see below), whose sum is σ = 160719936. Its totient is φ = 50753088.

The previous prime is 97805971. The next prime is 97805987. The reversal of 97805985 is 58950879.

It is not a de Polignac number, because 97805985 - 2⁶ = 97805921 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (97805987) 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, 87559 + ... + 88668.

It is an arithmetic number, because the mean of its divisors is an integer number (10044996).

Almost surely, 2^97805985 is an apocalyptic number.

It is an amenable number.

97805985 is a deficient number, since it is larger than the sum of its proper divisors (62913951).

97805985 is a wasteful number, since it uses less digits than its factorization.

97805985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176272.

The product of its (nonzero) digits is 907200, while the sum is 51.

The square root of 97805985 is about 9889.6908445108. The cubic root of 97805985 is about 460.7391786150.

It can be divided in two parts, 97805 and 985, that added together give a triangular number (98790 = T₄₄₄).

The spelling of 97805985 in words is "ninety-seven million, eight hundred five thousand, nine hundred eighty-five".