528309945 has 28 divisors (see below), whose sum is σ = 950529636. Its totient is φ = 281763360.

The previous prime is 528309923. The next prime is 528309961. The reversal of 528309945 is 549903825.

528309945 is a `hidden beast` number, since 528 + 30 + 9 + 94 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 116057529 + 412252416 = 10773^2 + 20304^2 .

It is not a de Polignac number, because 528309945 - 2⁵ = 528309913 is a prime.

It is a super-2 number, since 2×528309945² = 558222795971806050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 528309945.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 68826 + ... + 76115.

It is an arithmetic number, because the mean of its divisors is an integer number (33947487).

Almost surely, 2^528309945 is an apocalyptic number.

It is an amenable number.

528309945 is a deficient number, since it is larger than the sum of its proper divisors (422219691).

528309945 is an equidigital number, since it uses as much as digits as its factorization.

528309945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144964 (or 144949 counting only the distinct ones).

The product of its (nonzero) digits is 388800, while the sum is 45.

The square root of 528309945 is about 22984.9939090703. The cubic root of 528309945 is about 808.4061249737.

The spelling of 528309945 in words is "five hundred twenty-eight million, three hundred nine thousand, nine hundred forty-five".