87404581 has 8 divisors (see below), whose sum is σ = 95832000. Its totient is φ = 79057440.

The previous prime is 87404563. The next prime is 87404587. The reversal of 87404581 is 18540478.

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

It is not a de Polignac number, because 87404581 - 2⁹ = 87404069 is a prime.

It is a super-2 number, since 2×87404581² = 15279121559571122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 87404581.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87404587) 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, 17776 + ... + 22153.

It is an arithmetic number, because the mean of its divisors is an integer number (11979000).

Almost surely, 2^87404581 is an apocalyptic number.

It is an amenable number.

87404581 is a deficient number, since it is larger than the sum of its proper divisors (8427419).

87404581 is a wasteful number, since it uses less digits than its factorization.

87404581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40139.

The product of its (nonzero) digits is 35840, while the sum is 37.

The square root of 87404581 is about 9349.0417155984. The cubic root of 87404581 is about 443.7905651999.

The spelling of 87404581 in words is "eighty-seven million, four hundred four thousand, five hundred eighty-one".