87405581 has 8 divisors (see below), whose sum is σ = 89886720. Its totient is φ = 84930768.

The previous prime is 87405553. The next prime is 87405599. The reversal of 87405581 is 18550478.

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 87405581 - 2¹⁰ = 87404557 is a prime.

It is a super-2 number, since 2×87405581² = 15279471179895122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87405181) 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, 46400 + ... + 48246.

It is an arithmetic number, because the mean of its divisors is an integer number (11235840).

Almost surely, 2^87405581 is an apocalyptic number.

It is an amenable number.

87405581 is a deficient number, since it is larger than the sum of its proper divisors (2481139).

87405581 is a wasteful number, since it uses less digits than its factorization.

87405581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3163.

The product of its (nonzero) digits is 44800, while the sum is 38.

The square root of 87405581 is about 9349.0951968626. The cubic root of 87405581 is about 443.7922576698.

The spelling of 87405581 in words is "eighty-seven million, four hundred five thousand, five hundred eighty-one".