1021487728 has 20 divisors (see below), whose sum is σ = 2083297960. Its totient is φ = 483862464.

The previous prime is 1021487717. The next prime is 1021487737. The reversal of 1021487728 is 8277841201.

1021487728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 1679775 + ... + 1680382.

It is an arithmetic number, because the mean of its divisors is an integer number (104164898).

Almost surely, 2^1021487728 is an apocalyptic number.

It is an amenable number.

1021487728 is an abundant number, since it is smaller than the sum of its proper divisors (1061810232).

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

1021487728 is a wasteful number, since it uses less digits than its factorization.

1021487728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3360184 (or 3360178 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 40.

The square root of 1021487728 is about 31960.7216439179. The cubic root of 1021487728 is about 1007.1118772979. Note that the first 3 decimals are identical.

The spelling of 1021487728 in words is "one billion, twenty-one million, four hundred eighty-seven thousand, seven hundred twenty-eight".