720976 has 10 divisors (see below), whose sum is σ = 1396922. Its totient is φ = 360480.

The previous prime is 720971. The next prime is 720983. The reversal of 720976 is 679027.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 705600 + 15376 = 840^2 + 124^2 .

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720971) by changing a digit.

720976 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22515 + ... + 22546.

2⁷²⁰⁹⁷⁶ is an apocalyptic number.

It is an amenable number.

720976 is a deficient number, since it is larger than the sum of its proper divisors (675946).

720976 is a wasteful number, since it uses less digits than its factorization.

720976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45069 (or 45063 counting only the distinct ones).

The product of its (nonzero) digits is 5292, while the sum is 31.

The square root of 720976 is about 849.1030561716. The cubic root of 720976 is about 89.6685752662.

The spelling of 720976 in words is "seven hundred twenty thousand, nine hundred seventy-six".