28028005025 has 24 divisors (see below), whose sum is σ = 35016683640. Its totient is φ = 22253736960.

The previous prime is 28028005007. The next prime is 28028005037. The reversal of 28028005025 is 52050082082.

It is a happy number.

It can be written as a sum of positive squares in 12 ways, for example, as 4370796544 + 23657208481 = 66112^2 + 153809^2 .

It is not a de Polignac number, because 28028005025 - 2¹⁸ = 28027742881 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28028004982 and 28028005000.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3831071 + ... + 3838379.

It is an arithmetic number, because the mean of its divisors is an integer number (1459028485).

Almost surely, 2^28028005025 is an apocalyptic number.

28028005025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28028005025 is a deficient number, since it is larger than the sum of its proper divisors (6988678615).

28028005025 is a wasteful number, since it uses less digits than its factorization.

28028005025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8453 (or 8448 counting only the distinct ones).

The product of its (nonzero) digits is 12800, while the sum is 32.

The spelling of 28028005025 in words is "twenty-eight billion, twenty-eight million, five thousand, twenty-five".