28203685425 has 18 divisors (see below), whose sum is σ = 50515934742. Its totient is φ = 15041965440.

The previous prime is 28203685409. The next prime is 28203685427. The reversal of 28203685425 is 52458630282.

28203685425 is a `hidden beast` number, since 28 + 20 + 3 + 68 + 542 + 5 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 573267249 + 27630418176 = 23943^2 + 166224^2 .

It is not a de Polignac number, because 28203685425 - 2⁴ = 28203685409 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (28203685427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 62674632 + ... + 62675081.

It is an arithmetic number, because the mean of its divisors is an integer number (2806440819).

Almost surely, 2^28203685425 is an apocalyptic number.

28203685425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28203685425 is a deficient number, since it is larger than the sum of its proper divisors (22312249317).

28203685425 is a wasteful number, since it uses less digits than its factorization.

28203685425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125349729 (or 125349721 counting only the distinct ones).

The product of its (nonzero) digits is 921600, while the sum is 45.

The spelling of 28203685425 in words is "twenty-eight billion, two hundred three million, six hundred eighty-five thousand, four hundred twenty-five".