87621 has 4 divisors (see below), whose sum is σ = 116832. Its totient is φ = 58412.

The previous prime is 87613. The next prime is 87623. The reversal of 87621 is 12678.

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 87621 - 2³ = 87613 is a prime.

It is a D-number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 87591 and 87600.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 87621.

It is not an unprimeable number, because it can be changed into a prime (87623) 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, 14601 + ... + 14606.

It is an arithmetic number, because the mean of its divisors is an integer number (29208).

2⁸⁷⁶²¹ is an apocalyptic number.

It is an amenable number.

87621 is a deficient number, since it is larger than the sum of its proper divisors (29211).

87621 is a wasteful number, since it uses less digits than its factorization.

87621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29210.

The product of its digits is 672, while the sum is 24.

The square root of 87621 is about 296.0084458255. The cubic root of 87621 is about 44.4156547346.

The spelling of 87621 in words is "eighty-seven thousand, six hundred twenty-one".