720828747 has 16 divisors (see below), whose sum is σ = 1130712480. Its totient is φ = 452284416.

The previous prime is 720828743. The next prime is 720828761. The reversal of 720828747 is 747828027.

It is not a de Polignac number, because 720828747 - 2² = 720828743 is a prime.

It is not an unprimeable number, because it can be changed into a prime (720828743) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 784758 + ... + 785675.

It is an arithmetic number, because the mean of its divisors is an integer number (70669530).

Almost surely, 2^720828747 is an apocalyptic number.

720828747 is a deficient number, since it is larger than the sum of its proper divisors (409883733).

720828747 is a wasteful number, since it uses less digits than its factorization.

720828747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1570459 (or 1570453 counting only the distinct ones).

The product of its (nonzero) digits is 351232, while the sum is 45.

The square root of 720828747 is about 26848.2540773139. The cubic root of 720828747 is about 896.6247017822.

The spelling of 720828747 in words is "seven hundred twenty million, eight hundred twenty-eight thousand, seven hundred forty-seven".