87013621 has 8 divisors (see below), whose sum is σ = 90713088. Its totient is φ = 83370000.

The previous prime is 87013607. The next prime is 87013643. The reversal of 87013621 is 12631078.

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 87013621 - 2⁹ = 87013109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 87013621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87013691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10765 + ... + 17026.

It is an arithmetic number, because the mean of its divisors is an integer number (11339136).

Almost surely, 2^87013621 is an apocalyptic number.

It is an amenable number.

87013621 is a deficient number, since it is larger than the sum of its proper divisors (3699467).

87013621 is a wasteful number, since it uses less digits than its factorization.

87013621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27923.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 87013621 is about 9328.1091867538. The cubic root of 87013621 is about 443.1278855985.

Adding to 87013621 its reverse (12631078), we get a palindrome (99644699).

The spelling of 87013621 in words is "eighty-seven million, thirteen thousand, six hundred twenty-one".