308528035209 has 15 divisors (see below), whose sum is σ = 460895026647. Its totient is φ = 205682024088.

The previous prime is 308528035183. The next prime is 308528035219. The reversal of 308528035209 is 902530825803.

The square root of 308528035209 is 555453.

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., 29503215225 + 279024819984 = 171765^2 + 528228^2 .

It is not a de Polignac number, because 308528035209 - 2¹⁷ = 308527904137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (308528035219) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 4968219 + ... + 5029935.

Almost surely, 2^308528035209 is an apocalyptic number.

308528035209 is the 555453-rd square number.

308528035209 is the 277727-th centered octagonal number.

It is an amenable number.

308528035209 is a deficient number, since it is larger than the sum of its proper divisors (152366991438).

308528035209 is an frugal number, since it uses more digits than its factorization.

308528035209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123446 (or 61720 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 45.

The spelling of 308528035209 in words is "three hundred eight billion, five hundred twenty-eight million, thirty-five thousand, two hundred nine".