528678772609 has 9 divisors (see below), whose sum is σ = 572484882819. Its totient is φ = 488002449480.

The previous prime is 528678772577. The next prime is 528678772673. The reversal of 528678772609 is 906277876825.

The square root of 528678772609 is 727103.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 78206919025 + 450471853584 = 279655^2 + 671172^2 .

It is not a de Polignac number, because 528678772609 - 2⁵ = 528678772577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (528678722609) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9424374 + ... + 9480304.

Almost surely, 2^528678772609 is an apocalyptic number.

528678772609 is the 727103-rd square number.

528678772609 is the 363552-nd centered octagonal number.

It is an amenable number.

528678772609 is a deficient number, since it is larger than the sum of its proper divisors (43806110210).

528678772609 is an frugal number, since it uses more digits than its factorization.

528678772609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111888 (or 55944 counting only the distinct ones).

The product of its (nonzero) digits is 142248960, while the sum is 67.

The spelling of 528678772609 in words is "five hundred twenty-eight billion, six hundred seventy-eight million, seven hundred seventy-two thousand, six hundred nine".