81087850 has 24 divisors (see below), whose sum is σ = 152326188. Its totient is φ = 32112000.

The previous prime is 81087817. The next prime is 81087859. The reversal of 81087850 is 5878018.

It can be written as a sum of positive squares in 6 ways, for example, as 50936769 + 30151081 = 7137^2 + 5491^2 .

It is not an unprimeable number, because it can be changed into a prime (81087859) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2979 + ... + 13078.

Almost surely, 2^81087850 is an apocalyptic number.

81087850 is a deficient number, since it is larger than the sum of its proper divisors (71238338).

81087850 is a wasteful number, since it uses less digits than its factorization.

81087850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16170 (or 16165 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 81087850 is about 9004.8792329492. The cubic root of 81087850 is about 432.8312363352.

The spelling of 81087850 in words is "eighty-one million, eighty-seven thousand, eight hundred fifty".