87728563 has 4 divisors (see below), whose sum is σ = 94476928. Its totient is φ = 80980200.

The previous prime is 87728533. The next prime is 87728573. The reversal of 87728563 is 36582778.

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 87728563 - 2¹³ = 87720371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87728503) 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, 3374163 + ... + 3374188.

It is an arithmetic number, because the mean of its divisors is an integer number (23619232).

Almost surely, 2^87728563 is an apocalyptic number.

87728563 is a deficient number, since it is larger than the sum of its proper divisors (6748365).

87728563 is a wasteful number, since it uses less digits than its factorization.

87728563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6748364.

The product of its digits is 564480, while the sum is 46.

The square root of 87728563 is about 9366.3527052957. The cubic root of 87728563 is about 444.3382209731.

The spelling of 87728563 in words is "eighty-seven million, seven hundred twenty-eight thousand, five hundred sixty-three".