720208987 has 2 divisors, whose sum is σ = 720208988. Its totient is φ = 720208986.

The previous prime is 720208969. The next prime is 720208991. The reversal of 720208987 is 789802027.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 720208987 - 2¹⁹ = 719684699 is a prime.

It is not a weakly prime, because it can be changed into another prime (720208087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360104493 + 360104494.

It is an arithmetic number, because the mean of its divisors is an integer number (360104494).

Almost surely, 2^720208987 is an apocalyptic number.

720208987 is a deficient number, since it is larger than the sum of its proper divisors (1).

720208987 is an equidigital number, since it uses as much as digits as its factorization.

720208987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 43.

The square root of 720208987 is about 26836.7096902731. The cubic root of 720208987 is about 896.3676590090.

The spelling of 720208987 in words is "seven hundred twenty million, two hundred eight thousand, nine hundred eighty-seven".