87491240 has 32 divisors (see below), whose sum is σ = 201437280. Its totient is φ = 34181952.

The previous prime is 87491177. The next prime is 87491249. The reversal of 87491240 is 4219478.

It is a super-3 number, since 3×87491240³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87491240.

It is not an unprimeable number, because it can be changed into a prime (87491249) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23714 + ... + 27153.

It is an arithmetic number, because the mean of its divisors is an integer number (6294915).

Almost surely, 2^87491240 is an apocalyptic number.

It is an amenable number.

87491240 is an abundant number, since it is smaller than the sum of its proper divisors (113946040).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

87491240 is a wasteful number, since it uses less digits than its factorization.

87491240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50921 (or 50917 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 87491240 is about 9353.6752135190. The cubic root of 87491240 is about 443.9371850644.

The spelling of 87491240 in words is "eighty-seven million, four hundred ninety-one thousand, two hundred forty".