87649 has 2 divisors, whose sum is σ = 87650. Its totient is φ = 87648.

The previous prime is 87643. The next prime is 87671. The reversal of 87649 is 94678.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70225 + 17424 = 265^2 + 132^2 .

It is a cyclic number.

It is not a de Polignac number, because 87649 - 2³ = 87641 is a prime.

It is not a weakly prime, because it can be changed into another prime (87641) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43824 + 43825.

It is an arithmetic number, because the mean of its divisors is an integer number (43825).

2⁸⁷⁶⁴⁹ is an apocalyptic number.

It is an amenable number.

87649 is a deficient number, since it is larger than the sum of its proper divisors (1).

87649 is an equidigital number, since it uses as much as digits as its factorization.

87649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 34.

The square root of 87649 is about 296.0557379954. The cubic root of 87649 is about 44.4203853581.

It can be divided in two parts, 876 and 49, that multiplied together give a palindrome (42924).

The spelling of 87649 in words is "eighty-seven thousand, six hundred forty-nine".