721094028 has 24 divisors (see below), whose sum is σ = 1687383600. Its totient is φ = 239674560.

The previous prime is 721094009. The next prime is 721094029. The reversal of 721094028 is 820490127.

It is a happy number.

721094028 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 721094028.

It is not an unprimeable number, because it can be changed into a prime (721094029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 81903 + ... + 90278.

It is an arithmetic number, because the mean of its divisors is an integer number (70307650).

Almost surely, 2^721094028 is an apocalyptic number.

It is an amenable number.

721094028 is an abundant number, since it is smaller than the sum of its proper divisors (966289572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

721094028 is a wasteful number, since it uses less digits than its factorization.

721094028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172537 (or 172535 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 721094028 is about 26853.1939999695. The cubic root of 721094028 is about 896.7346808979.

The spelling of 721094028 in words is "seven hundred twenty-one million, ninety-four thousand, twenty-eight".