720987 has 16 divisors (see below), whose sum is σ = 1037952. Its totient is φ = 443520.

The previous prime is 720983. The next prime is 720991. The reversal of 720987 is 789027.

It is an interprime number because it is at equal distance from previous prime (720983) and next prime (720991).

It is not a de Polignac number, because 720987 - 2² = 720983 is a prime.

720987 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (720983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3312 + ... + 3522.

It is an arithmetic number, because the mean of its divisors is an integer number (64872).

2⁷²⁰⁹⁸⁷ is an apocalyptic number.

720987 is a deficient number, since it is larger than the sum of its proper divisors (316965).

720987 is a wasteful number, since it uses less digits than its factorization.

720987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 298.

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 720987 is about 849.1095335703. The cubic root of 720987 is about 89.6690312912.

The spelling of 720987 in words is "seven hundred twenty thousand, nine hundred eighty-seven".