87081863 has 4 divisors (see below), whose sum is σ = 94998408. Its totient is φ = 79165320.

The previous prime is 87081859. The next prime is 87081899. The reversal of 87081863 is 36818078.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87081863 - 2² = 87081859 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87081863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87081563) 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, 3958256 + ... + 3958277.

It is an arithmetic number, because the mean of its divisors is an integer number (23749602).

Almost surely, 2^87081863 is an apocalyptic number.

87081863 is a deficient number, since it is larger than the sum of its proper divisors (7916545).

87081863 is a wasteful number, since it uses less digits than its factorization.

87081863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7916544.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 87081863 is about 9331.7663386949. The cubic root of 87081863 is about 443.2436990036.

The spelling of 87081863 in words is "eighty-seven million, eighty-one thousand, eight hundred sixty-three".