709428989 has 8 divisors (see below), whose sum is σ = 752558328. Its totient is φ = 666455040.

The previous prime is 709428961. The next prime is 709428991. The reversal of 709428989 is 989824907.

It is a happy number.

709428989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 343472089 + 365956900 = 18533^2 + 19130^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 709428989 - 2¹² = 709424893 is a prime.

It is a Duffinian number.

It is a zygodrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (709428959) 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, 29372 + ... + 47765.

It is an arithmetic number, because the mean of its divisors is an integer number (94069791).

Almost surely, 2^709428989 is an apocalyptic number.

It is an amenable number.

709428989 is a deficient number, since it is larger than the sum of its proper divisors (43129339).

709428989 is a wasteful number, since it uses less digits than its factorization.

709428989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77695.

The product of its (nonzero) digits is 2612736, while the sum is 56.

The square root of 709428989 is about 26635.1082032719. The cubic root of 709428989 is about 891.8729186296.

The spelling of 709428989 in words is "seven hundred nine million, four hundred twenty-eight thousand, nine hundred eighty-nine".