145805728 has 24 divisors (see below), whose sum is σ = 287561988. Its totient is φ = 72774144.

The previous prime is 145805701. The next prime is 145805731. The reversal of 145805728 is 827508541.

It can be written as a sum of positive squares in 2 ways, for example, as 94711824 + 51093904 = 9732^2 + 7148^2 .

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, 15900 + ... + 23332.

Almost surely, 2^145805728 is an apocalyptic number.

It is an amenable number.

145805728 is a deficient number, since it is larger than the sum of its proper divisors (141756260).

145805728 is an equidigital number, since it uses as much as digits as its factorization.

145805728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8056 (or 8048 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 40.

The square root of 145805728 is about 12075.0042650096. The cubic root of 145805728 is about 526.3300852875.

The spelling of 145805728 in words is "one hundred forty-five million, eight hundred five thousand, seven hundred twenty-eight".