87563681 has 4 divisors (see below), whose sum is σ = 87595200. Its totient is φ = 87532164.

The previous prime is 87563677. The next prime is 87563683. The reversal of 87563681 is 18636578.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87563681 - 2² = 87563677 is a prime.

It is a super-2 number, since 2×87563681² = 15334796460539522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87563683) 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, 11141 + ... + 17298.

It is an arithmetic number, because the mean of its divisors is an integer number (21898800).

Almost surely, 2^87563681 is an apocalyptic number.

It is an amenable number.

87563681 is a deficient number, since it is larger than the sum of its proper divisors (31519).

87563681 is a wasteful number, since it uses less digits than its factorization.

87563681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31518.

The product of its digits is 241920, while the sum is 44.

The square root of 87563681 is about 9357.5467404657. The cubic root of 87563681 is about 444.0596749729.

The spelling of 87563681 in words is "eighty-seven million, five hundred sixty-three thousand, six hundred eighty-one".