28509245754025 has 27 divisors (see below), whose sum is σ = 35543877313399. Its totient is φ = 22683928202000.

The previous prime is 28509245754013. The next prime is 28509245754089. The reversal of 28509245754025 is 52045754290582.

It is a happy number.

The square root of 28509245754025 is 5339405.

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., 10263328471449 + 18245917282576 = 3203643^2 + 4271524^2 .

It is not a de Polignac number, because 28509245754025 - 2³¹ = 28507098270377 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 5099128980 + ... + 5099134570.

Almost surely, 2^{28509245754025} is an apocalyptic number.

28509245754025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28509245754025 is the 5339405-th square number.

28509245754025 is the 2669703-rd centered octagonal number.

It is an amenable number.

28509245754025 is a deficient number, since it is larger than the sum of its proper divisors (7034631559374).

28509245754025 is an frugal number, since it uses more digits than its factorization.

28509245754025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11574 (or 5787 counting only the distinct ones).

The product of its (nonzero) digits is 40320000, while the sum is 58.

The spelling of 28509245754025 in words is "twenty-eight trillion, five hundred nine billion, two hundred forty-five million, seven hundred fifty-four thousand, twenty-five".