87689647399 has 2 divisors, whose sum is σ = 87689647400. Its totient is φ = 87689647398.

The previous prime is 87689647379. The next prime is 87689647421. The reversal of 87689647399 is 99374698678.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87689647399 - 2⁷ = 87689647271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87689647379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43844823699 + 43844823700.

It is an arithmetic number, because the mean of its divisors is an integer number (43844823700).

Almost surely, 2^87689647399 is an apocalyptic number.

87689647399 is a deficient number, since it is larger than the sum of its proper divisors (1).

87689647399 is an equidigital number, since it uses as much as digits as its factorization.

87689647399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 987614208, while the sum is 76.

The spelling of 87689647399 in words is "eighty-seven billion, six hundred eighty-nine million, six hundred forty-seven thousand, three hundred ninety-nine".