7275578209 has 3 divisors (see below), whose sum is σ = 7275663507. Its totient is φ = 7275492912.

The previous prime is 7275578197. The next prime is 7275578257. The reversal of 7275578209 is 9028755727.

The square root of 7275578209 is 85297.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 4264225 + 7271313984 = 2065^2 + 85272^2 .

It is not a de Polignac number, because 7275578209 - 2⁹ = 7275577697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7275578309) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 42649 + ... + 127945.

It is an arithmetic number, because the mean of its divisors is an integer number (2425221169).

Almost surely, 2^7275578209 is an apocalyptic number.

7275578209 is the 85297-th square number.

7275578209 is the 42649-th centered octagonal number.

It is an amenable number.

7275578209 is a deficient number, since it is larger than the sum of its proper divisors (85298).

7275578209 is an frugal number, since it uses more digits than its factorization.

7275578209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170594 (or 85297 counting only the distinct ones).

The product of its (nonzero) digits is 2469600, while the sum is 52.

The cubic root of 7275578209 is about 1937.7117429022.

The spelling of 7275578209 in words is "seven billion, two hundred seventy-five million, five hundred seventy-eight thousand, two hundred nine".