705945728 has 32 divisors (see below), whose sum is σ = 1408111020. Its totient is φ = 352537600.

The previous prime is 705945719. The next prime is 705945731. The reversal of 705945728 is 827549507.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 705008704 + 937024 = 26552^2 + 968^2 .

It is a tau number, because it is divible by the number of its divisors (32).

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, 117518 + ... + 123378.

Almost surely, 2^705945728 is an apocalyptic number.

It is an amenable number.

705945728 is a deficient number, since it is larger than the sum of its proper divisors (702165292).

705945728 is an equidigital number, since it uses as much as digits as its factorization.

705945728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6816 (or 6804 counting only the distinct ones).

The product of its (nonzero) digits is 705600, while the sum is 47.

The square root of 705945728 is about 26569.6392147127. The cubic root of 705945728 is about 890.4108392309.

The spelling of 705945728 in words is "seven hundred five million, nine hundred forty-five thousand, seven hundred twenty-eight".