87651 has 6 divisors (see below), whose sum is σ = 126620. Its totient is φ = 58428.

The previous prime is 87649. The next prime is 87671. The reversal of 87651 is 15678.

87651 is a `hidden beast` number, since 8 + 7 + 651 = 666.

It is not a de Polignac number, because 87651 - 2¹ = 87649 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 87651.

It is not an unprimeable number, because it can be changed into a prime (87631) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4861 + ... + 4878.

2⁸⁷⁶⁵¹ is an apocalyptic number.

87651 is a deficient number, since it is larger than the sum of its proper divisors (38969).

87651 is a wasteful number, since it uses less digits than its factorization.

87651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9745 (or 9742 counting only the distinct ones).

The product of its digits is 1680, while the sum is 27.

The square root of 87651 is about 296.0591157185. The cubic root of 87651 is about 44.4207232212.

Adding to 87651 its sum of digits (27), we get a palindrome (87678).

The spelling of 87651 in words is "eighty-seven thousand, six hundred fifty-one".