87990481 has 2 divisors, whose sum is σ = 87990482. Its totient is φ = 87990480.

The previous prime is 87990467. The next prime is 87990503. The reversal of 87990481 is 18409978.

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., 87890625 + 99856 = 9375^2 + 316^2 .

It is a cyclic number.

It is not a de Polignac number, because 87990481 - 2⁵ = 87990449 is a prime.

It is a super-2 number, since 2×87990481² = 15484649493222722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (87990401) 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 as a sum of consecutive naturals, namely, 43995240 + 43995241.

It is an arithmetic number, because the mean of its divisors is an integer number (43995241).

Almost surely, 2^87990481 is an apocalyptic number.

It is an amenable number.

87990481 is a deficient number, since it is larger than the sum of its proper divisors (1).

87990481 is an equidigital number, since it uses as much as digits as its factorization.

87990481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 87990481 is about 9380.3241415209. The cubic root of 87990481 is about 444.7799796064.

The spelling of 87990481 in words is "eighty-seven million, nine hundred ninety thousand, four hundred eighty-one".