87140689 has 2 divisors, whose sum is σ = 87140690. Its totient is φ = 87140688.

The previous prime is 87140681. The next prime is 87140719. The reversal of 87140689 is 98604178.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69222400 + 17918289 = 8320^2 + 4233^2 .

It is a cyclic number.

It is not a de Polignac number, because 87140689 - 2³ = 87140681 is a prime.

It is not a weakly prime, because it can be changed into another prime (87140681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43570344 + 43570345.

It is an arithmetic number, because the mean of its divisors is an integer number (43570345).

Almost surely, 2^87140689 is an apocalyptic number.

It is an amenable number.

87140689 is a deficient number, since it is larger than the sum of its proper divisors (1).

87140689 is an equidigital number, since it uses as much as digits as its factorization.

87140689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 87140689 is about 9334.9177286144. The cubic root of 87140689 is about 443.3434839794.

The spelling of 87140689 in words is "eighty-seven million, one hundred forty thousand, six hundred eighty-nine".