1005645728 has 24 divisors (see below), whose sum is σ = 1986130692. Its totient is φ = 501231616.

The previous prime is 1005645701. The next prime is 1005645743. The reversal of 1005645728 is 8275465001.

It can be written as a sum of positive squares in 2 ways, for example, as 717596944 + 288048784 = 26788^2 + 16972^2 .

It is a super-2 number, since 2×1005645728² = 2022646660489299968, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1005645691 and 1005645700.

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, 39425 + ... + 59712.

Almost surely, 2^1005645728 is an apocalyptic number.

It is an amenable number.

1005645728 is a deficient number, since it is larger than the sum of its proper divisors (980484964).

1005645728 is an equidigital number, since it uses as much as digits as its factorization.

1005645728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99464 (or 99456 counting only the distinct ones).

The product of its (nonzero) digits is 67200, while the sum is 38.

The square root of 1005645728 is about 31711.9177597319. The cubic root of 1005645728 is about 1001.8783788172.

The spelling of 1005645728 in words is "one billion, five million, six hundred forty-five thousand, seven hundred twenty-eight".