87636521 has 8 divisors (see below), whose sum is σ = 103609920. Its totient is φ = 72526608.

The previous prime is 87636503. The next prime is 87636541. The reversal of 87636521 is 12563678.

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

It is not a de Polignac number, because 87636521 - 2⁶ = 87636457 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87636541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 215651 + ... + 216056.

It is an arithmetic number, because the mean of its divisors is an integer number (12951240).

Almost surely, 2^87636521 is an apocalyptic number.

It is an amenable number.

87636521 is a deficient number, since it is larger than the sum of its proper divisors (15973399).

87636521 is a wasteful number, since it uses less digits than its factorization.

87636521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431743.

The product of its digits is 60480, while the sum is 38.

The square root of 87636521 is about 9361.4379771486. The cubic root of 87636521 is about 444.1827714503.

The spelling of 87636521 in words is "eighty-seven million, six hundred thirty-six thousand, five hundred twenty-one".