85217787 has 24 divisors (see below), whose sum is σ = 133374384. Its totient is φ = 52222464.

The previous prime is 85217777. The next prime is 85217789. The reversal of 85217787 is 78771258.

It is not a de Polignac number, because 85217787 - 2⁷ = 85217659 is a prime.

It is not an unprimeable number, because it can be changed into a prime (85217789) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103 + ... + 13055.

It is an arithmetic number, because the mean of its divisors is an integer number (5557266).

Almost surely, 2^85217787 is an apocalyptic number.

85217787 is a deficient number, since it is larger than the sum of its proper divisors (48156597).

85217787 is a wasteful number, since it uses less digits than its factorization.

85217787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13019 (or 13016 counting only the distinct ones).

The product of its digits is 219520, while the sum is 45.

The square root of 85217787 is about 9231.3480597365. The cubic root of 85217787 is about 440.0581655199.

The spelling of 85217787 in words is "eighty-five million, two hundred seventeen thousand, seven hundred eighty-seven".