75187285209 has 15 divisors (see below), whose sum is σ = 112320495397. Its totient is φ = 50123211588.

The previous prime is 75187285183. The next prime is 75187285249. The reversal of 75187285209 is 90258278157.

The square root of 75187285209 is 274203.

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

75187285209 is a `hidden beast` number, since 7 + 518 + 72 + 8 + 52 + 0 + 9 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-75187285209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (75187285249) 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, 2452594 + ... + 2483060.

Almost surely, 2^75187285209 is an apocalyptic number.

75187285209 is the 274203-rd square number.

75187285209 is the 137102-nd centered octagonal number.

It is an amenable number.

75187285209 is a deficient number, since it is larger than the sum of its proper divisors (37133210188).

75187285209 is an frugal number, since it uses more digits than its factorization.

75187285209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60946 (or 30470 counting only the distinct ones).

The product of its (nonzero) digits is 2822400, while the sum is 54.

The spelling of 75187285209 in words is "seventy-five billion, one hundred eighty-seven million, two hundred eighty-five thousand, two hundred nine".