74691250209 has 9 divisors (see below), whose sum is σ = 107888545713. Its totient is φ = 49793620212.

The previous prime is 74691250199. The next prime is 74691250211. The reversal of 74691250209 is 90205219647.

The square root of 74691250209 is 273297.

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

74691250209 is a `hidden beast` number, since 74 + 69 + 12 + 502 + 0 + 9 = 666.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 74691250209 - 2³³ = 66101315617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (74691250219) 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, 774342 + ... + 865440.

Almost surely, 2^74691250209 is an apocalyptic number.

74691250209 is the 273297-th square number.

74691250209 is the 136649-th centered octagonal number.

It is an amenable number.

74691250209 is a deficient number, since it is larger than the sum of its proper divisors (33197295504).

74691250209 is an frugal number, since it uses more digits than its factorization.

74691250209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182204 (or 91102 counting only the distinct ones).

The product of its (nonzero) digits is 272160, while the sum is 45.

It can be divided in two parts, 74691 and 250209, that added together give a square (324900 = 570²).

The spelling of 74691250209 in words is "seventy-four billion, six hundred ninety-one million, two hundred fifty thousand, two hundred nine".