87530391 has 24 divisors (see below), whose sum is σ = 140556416. Its totient is φ = 52125120.

The previous prime is 87530371. The next prime is 87530423. The reversal of 87530391 is 19303578.

It is not a de Polignac number, because 87530391 - 2²⁵ = 53975959 is a prime.

It is a super-2 number, since 2×87530391² = 15323138697225762, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87530371) 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 23 ways as a sum of consecutive naturals, for example, 8440 + ... + 15693.

Almost surely, 2^87530391 is an apocalyptic number.

87530391 is a deficient number, since it is larger than the sum of its proper divisors (53026025).

87530391 is a wasteful number, since it uses less digits than its factorization.

87530391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24183 (or 24180 counting only the distinct ones).

The product of its (nonzero) digits is 22680, while the sum is 36.

The square root of 87530391 is about 9355.7677931851. The cubic root of 87530391 is about 444.0033935704.

The spelling of 87530391 in words is "eighty-seven million, five hundred thirty thousand, three hundred ninety-one".