25028189209 has 9 divisors (see below), whose sum is σ = 25162267519. Its totient is φ = 24894824080.

The previous prime is 25028189167. The next prime is 25028189231. The reversal of 25028189209 is 90298182052.

25028189209 = 1³ + 2³ + ... + 562³.

The square root of 25028189209 is 158203.

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., 16913782809 + 8114406400 = 130053^2 + 90080^2 .

It is not a de Polignac number, because 25028189209 - 2¹⁷ = 25028058137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (25028189279) 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, 44454762 + ... + 44455324.

Almost surely, 2^25028189209 is an apocalyptic number.

25028189209 is the 158203-rd square number.

25028189209 is the 79102-nd centered octagonal number.

It is an amenable number.

25028189209 is a deficient number, since it is larger than the sum of its proper divisors (134078310).

25028189209 is an frugal number, since it uses more digits than its factorization.

25028189209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1688 (or 844 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 46.

The spelling of 25028189209 in words is "twenty-five billion, twenty-eight million, one hundred eighty-nine thousand, two hundred nine".