85438566 has 24 divisors (see below), whose sum is σ = 196006824. Its totient is φ = 26804160.

The previous prime is 85438531. The next prime is 85438567. The reversal of 85438566 is 66583458.

85438566 is a `hidden beast` number, since 8 + 54 + 38 + 566 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (85438567) 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 11 ways as a sum of consecutive naturals, for example, 139300 + ... + 139911.

It is an arithmetic number, because the mean of its divisors is an integer number (8166951).

Almost surely, 2^85438566 is an apocalyptic number.

85438566 is an abundant number, since it is smaller than the sum of its proper divisors (110568258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

85438566 is a wasteful number, since it uses less digits than its factorization.

85438566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 279236 (or 279233 counting only the distinct ones).

The product of its digits is 691200, while the sum is 45.

The square root of 85438566 is about 9243.2984372463. The cubic root of 85438566 is about 440.4378664538.

The spelling of 85438566 in words is "eighty-five million, four hundred thirty-eight thousand, five hundred sixty-six".