87581481 has 8 divisors (see below), whose sum is σ = 125758080. Its totient is φ = 53896272.

The previous prime is 87581477. The next prime is 87581503. The reversal of 87581481 is 18418578.

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

It is not a de Polignac number, because 87581481 - 2² = 87581477 is a prime.

It is a super-2 number, since 2×87581481² = 15341031628306722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (87581471) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1122801 + ... + 1122878.

It is an arithmetic number, because the mean of its divisors is an integer number (15719760).

Almost surely, 2^87581481 is an apocalyptic number.

It is an amenable number.

87581481 is a deficient number, since it is larger than the sum of its proper divisors (38176599).

87581481 is a wasteful number, since it uses less digits than its factorization.

87581481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2245695.

The product of its digits is 71680, while the sum is 42.

The square root of 87581481 is about 9358.4977961209. The cubic root of 87581481 is about 444.0897625107.

The spelling of 87581481 in words is "eighty-seven million, five hundred eighty-one thousand, four hundred eighty-one".