87820531 has 8 divisors (see below), whose sum is σ = 88484864. Its totient is φ = 87159240.

The previous prime is 87820529. The next prime is 87820547. The reversal of 87820531 is 13502878.

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 87820531 - 2¹ = 87820529 is a prime.

It is a super-2 number, since 2×87820531² = 15424891330243922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87820501) 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, 99016 + ... + 99898.

It is an arithmetic number, because the mean of its divisors is an integer number (11060608).

Almost surely, 2^87820531 is an apocalyptic number.

87820531 is the 5411-st hex number.

87820531 is a deficient number, since it is larger than the sum of its proper divisors (664333).

87820531 is a wasteful number, since it uses less digits than its factorization.

87820531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 87820531 is about 9371.2609076901. The cubic root of 87820531 is about 444.4934369580.

The spelling of 87820531 in words is "eighty-seven million, eight hundred twenty thousand, five hundred thirty-one".