709129728 has 100 divisors (see below), whose sum is σ = 2116689300. Its totient is φ = 236362752.

The previous prime is 709129709. The next prime is 709129769. The reversal of 709129728 is 827921907.

It is a super-2 number, since 2×709129728² = 1005729942266707968, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 32923 + ... + 50021.

It is an arithmetic number, because the mean of its divisors is an integer number (21166893).

Almost surely, 2^709129728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 709129728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058344650).

709129728 is an abundant number, since it is smaller than the sum of its proper divisors (1407559572).

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

709129728 is an equidigital number, since it uses as much as digits as its factorization.

709129728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17129 (or 17104 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 709129728 is about 26629.4898186203. The cubic root of 709129728 is about 891.7474936639.

The spelling of 709129728 in words is "seven hundred nine million, one hundred twenty-nine thousand, seven hundred twenty-eight".