28207305213025 has 27 divisors (see below), whose sum is σ = 37156155035641. Its totient is φ = 21238101664640.

The previous prime is 28207305213019. The next prime is 28207305213037. The reversal of 28207305213025 is 52031250370282.

The square root of 28207305213025 is 5311055.

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

It can be written as a sum of positive squares in 4 ways, for example, as 659797173841 + 27547508039184 = 812279^2 + 5248572^2 .

It is not a de Polignac number, because 28207305213025 - 2⁷ = 28207305212897 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 451408434 + ... + 451470916.

Almost surely, 2^{28207305213025} is an apocalyptic number.

28207305213025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28207305213025 is the 5311055-th square number.

28207305213025 is the 2655528-th centered octagonal number.

It is an amenable number.

28207305213025 is a deficient number, since it is larger than the sum of its proper divisors (8948849822616).

28207305213025 is an frugal number, since it uses more digits than its factorization.

28207305213025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125010 (or 62505 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 40.

The spelling of 28207305213025 in words is "twenty-eight trillion, two hundred seven billion, three hundred five million, two hundred thirteen thousand, twenty-five".