87728863 has 4 divisors (see below), whose sum is σ = 87754240. Its totient is φ = 87703488.

The previous prime is 87728843. The next prime is 87728867. The reversal of 87728863 is 36882778.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87728863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87728867) 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, 6495 + ... + 14752.

It is an arithmetic number, because the mean of its divisors is an integer number (21938560).

Almost surely, 2^87728863 is an apocalyptic number.

87728863 is a deficient number, since it is larger than the sum of its proper divisors (25377).

87728863 is a wasteful number, since it uses less digits than its factorization.

87728863 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25376.

The product of its digits is 903168, while the sum is 49.

The square root of 87728863 is about 9366.3687200537. The cubic root of 87728863 is about 444.3387274646.

The spelling of 87728863 in words is "eighty-seven million, seven hundred twenty-eight thousand, eight hundred sixty-three".