85987820 has 12 divisors (see below), whose sum is σ = 180574464. Its totient is φ = 34395120.

The previous prime is 85987817. The next prime is 85987829. The reversal of 85987820 is 2878958.

It is not an unprimeable number, because it can be changed into a prime (85987829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2149676 + ... + 2149715.

It is an arithmetic number, because the mean of its divisors is an integer number (15047872).

Almost surely, 2^85987820 is an apocalyptic number.

It is an amenable number.

85987820 is an abundant number, since it is smaller than the sum of its proper divisors (94586644).

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

85987820 is a wasteful number, since it uses less digits than its factorization.

85987820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4299400 (or 4299398 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 85987820 is about 9272.9617706534. The cubic root of 85987820 is about 441.3796570509.

The spelling of 85987820 in words is "eighty-five million, nine hundred eighty-seven thousand, eight hundred twenty".