87720863 has 2 divisors, whose sum is σ = 87720864. Its totient is φ = 87720862.

The previous prime is 87720851. The next prime is 87720869. The reversal of 87720863 is 36802778.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87720863 - 2¹² = 87716767 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87720863.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87720869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43860431 + 43860432.

It is an arithmetic number, because the mean of its divisors is an integer number (43860432).

Almost surely, 2^87720863 is an apocalyptic number.

87720863 is a deficient number, since it is larger than the sum of its proper divisors (1).

87720863 is an equidigital number, since it uses as much as digits as its factorization.

87720863 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 87720863 is about 9365.9416504695. The cubic root of 87720863 is about 444.3252206294.

The spelling of 87720863 in words is "eighty-seven million, seven hundred twenty thousand, eight hundred sixty-three".