28939113225 has 81 divisors (see below), whose sum is σ = 57028960807. Its totient is φ = 14017476000.

The previous prime is 28939113223. The next prime is 28939113233. The reversal of 28939113225 is 52231193982.

The square root of 28939113225 is 170115.

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

28939113225 is a `hidden beast` number, since 28 + 9 + 391 + 13 + 225 = 666.

It can be written as a sum of positive squares in only one way, i.e., 10418080761 + 18521032464 = 102069^2 + 136092^2 .

It is not a de Polignac number, because 28939113225 - 2¹ = 28939113223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28939113223) 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, 28068460 + ... + 28069490.

Almost surely, 2^28939113225 is an apocalyptic number.

28939113225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28939113225 is the 170115-th square number.

28939113225 is the 85058-th centered octagonal number.

It is an amenable number.

28939113225 is a deficient number, since it is larger than the sum of its proper divisors (28089847582).

28939113225 is a wasteful number, since it uses less digits than its factorization.

28939113225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2100 (or 1050 counting only the distinct ones).

The product of its digits is 233280, while the sum is 45.

The spelling of 28939113225 in words is "twenty-eight billion, nine hundred thirty-nine million, one hundred thirteen thousand, two hundred twenty-five".