28107725 has 12 divisors (see below), whose sum is σ = 36369696. Its totient is φ = 21508080.

The previous prime is 28107697. The next prime is 28107727. The reversal of 28107725 is 52770182.

It is not a de Polignac number, because 28107725 - 2⁶ = 28107661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28107691 and 28107700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28107727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23867 + ... + 25016.

It is an arithmetic number, because the mean of its divisors is an integer number (3030808).

Almost surely, 2^28107725 is an apocalyptic number.

28107725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28107725 is a deficient number, since it is larger than the sum of its proper divisors (8261971).

28107725 is a wasteful number, since it uses less digits than its factorization.

28107725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48916 (or 48911 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 28107725 is about 5301.6719061066. The cubic root of 28107725 is about 304.0478232993.

The spelling of 28107725 in words is "twenty-eight million, one hundred seven thousand, seven hundred twenty-five".