721006756 has 12 divisors (see below), whose sum is σ = 1328170480. Its totient is φ = 341529480.

The previous prime is 721006733. The next prime is 721006789. The reversal of 721006756 is 657600127.

721006756 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4743390 + ... + 4743541.

Almost surely, 2^721006756 is an apocalyptic number.

721006756 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

721006756 is a deficient number, since it is larger than the sum of its proper divisors (607163724).

721006756 is a wasteful number, since it uses less digits than its factorization.

721006756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9486954 (or 9486952 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 34.

The square root of 721006756 is about 26851.5689671944. The cubic root of 721006756 is about 896.6985030055.

The spelling of 721006756 in words is "seven hundred twenty-one million, six thousand, seven hundred fifty-six".