28949618835225 has 81 divisors (see below), whose sum is σ = 56996077338109. Its totient is φ = 14035748390400.

The previous prime is 28949618835223. The next prime is 28949618835233. The reversal of 28949618835225 is 52253881694982.

It is a happy number.

The square root of 28949618835225 is 5380485.

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

28949618835225 is a `hidden beast` number, since 2 + 8 + 9 + 4 + 9 + 6 + 18 + 83 + 522 + 5 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 17397873801 + 28932220961424 = 131901^2 + 5378868^2 .

It is not a de Polignac number, because 28949618835225 - 2¹ = 28949618835223 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28949618835223) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 887763721 + ... + 887796329.

Almost surely, 2^{28949618835225} is an apocalyptic number.

28949618835225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28949618835225 is the 5380485-th square number.

28949618835225 is the 2690243-rd centered octagonal number.

It is an amenable number.

28949618835225 is a deficient number, since it is larger than the sum of its proper divisors (28046458502884).

28949618835225 is an frugal number, since it uses more digits than its factorization.

28949618835225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65256 (or 32628 counting only the distinct ones).

The product of its digits is 597196800, while the sum is 72.

The spelling of 28949618835225 in words is "twenty-eight trillion, nine hundred forty-nine billion, six hundred eighteen million, eight hundred thirty-five thousand, two hundred twenty-five".