720988 has 6 divisors (see below), whose sum is σ = 1261736. Its totient is φ = 360492.

The previous prime is 720983. The next prime is 720991. The reversal of 720988 is 889027.

It is a happy number.

It is a super-2 number, since 2×720988² = 1039647392288, which contains 22 as substring.

It is a congruent number.

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

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90120 + ... + 90127.

2⁷²⁰⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

720988 is a deficient number, since it is larger than the sum of its proper divisors (540748).

720988 is a wasteful number, since it uses less digits than its factorization.

720988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180251 (or 180249 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 34.

The square root of 720988 is about 849.1101224223. The cubic root of 720988 is about 89.6690727478.

The spelling of 720988 in words is "seven hundred twenty thousand, nine hundred eighty-eight".