87731563 has 8 divisors (see below), whose sum is σ = 89768448. Its totient is φ = 85701864.

The previous prime is 87731561. The next prime is 87731597. The reversal of 87731563 is 36513778.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 87731563 - 2¹ = 87731561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87731561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28770 + ... + 31672.

It is an arithmetic number, because the mean of its divisors is an integer number (11221056).

Almost surely, 2^87731563 is an apocalyptic number.

87731563 is a deficient number, since it is larger than the sum of its proper divisors (2036885).

87731563 is a wasteful number, since it uses less digits than its factorization.

87731563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3593.

The product of its digits is 105840, while the sum is 40.

The square root of 87731563 is about 9366.5128516433. The cubic root of 87731563 is about 444.3432858361.

The spelling of 87731563 in words is "eighty-seven million, seven hundred thirty-one thousand, five hundred sixty-three".