87795881 has 2 divisors, whose sum is σ = 87795882. Its totient is φ = 87795880.

The previous prime is 87795839. The next prime is 87795947. The reversal of 87795881 is 18859778.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64947481 + 22848400 = 8059^2 + 4780^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-87795881 is a prime.

It is a super-2 number, since 2×87795881² = 15416233441132322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (87795821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43897940 + 43897941.

It is an arithmetic number, because the mean of its divisors is an integer number (43897941).

Almost surely, 2^87795881 is an apocalyptic number.

It is an amenable number.

87795881 is a deficient number, since it is larger than the sum of its proper divisors (1).

87795881 is an equidigital number, since it uses as much as digits as its factorization.

87795881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 53.

The square root of 87795881 is about 9369.9456241752. The cubic root of 87795881 is about 444.4518453606.

The spelling of 87795881 in words is "eighty-seven million, seven hundred ninety-five thousand, eight hundred eighty-one".