87881261 has 8 divisors (see below), whose sum is σ = 96427800. Its totient is φ = 79589952.

The previous prime is 87881257. The next prime is 87881273. The reversal of 87881261 is 16218878.

It can be written as a sum of positive squares in 4 ways, for example, as 34445161 + 53436100 = 5869^2 + 7310^2 .

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

It is not a de Polignac number, because 87881261 - 2² = 87881257 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87881231) 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, 63086 + ... + 64463.

It is an arithmetic number, because the mean of its divisors is an integer number (12053475).

Almost surely, 2^87881261 is an apocalyptic number.

It is an amenable number.

87881261 is a deficient number, since it is larger than the sum of its proper divisors (8546539).

87881261 is a wasteful number, since it uses less digits than its factorization.

87881261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127615.

The product of its digits is 43008, while the sum is 41.

The square root of 87881261 is about 9374.5005733639. The cubic root of 87881261 is about 444.5958726343.

The spelling of 87881261 in words is "eighty-seven million, eight hundred eighty-one thousand, two hundred sixty-one".