28706725 has 12 divisors (see below), whose sum is σ = 35951940. Its totient is φ = 22736000.

The previous prime is 28706681. The next prime is 28706729. The reversal of 28706725 is 52760782.

It can be written as a sum of positive squares in 6 ways, for example, as 1018081 + 27688644 = 1009^2 + 5262^2 .

It is not a de Polignac number, because 28706725 - 2¹¹ = 28704677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28706729) 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 11 ways as a sum of consecutive naturals, for example, 3160 + ... + 8209.

It is an arithmetic number, because the mean of its divisors is an integer number (2995995).

Almost surely, 2^28706725 is an apocalyptic number.

28706725 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28706725 is a deficient number, since it is larger than the sum of its proper divisors (7245215).

28706725 is a wasteful number, since it uses less digits than its factorization.

28706725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11480 (or 11475 counting only the distinct ones).

The product of its (nonzero) digits is 47040, while the sum is 37.

The square root of 28706725 is about 5357.8657131362. The cubic root of 28706725 is about 306.1925006586.

The spelling of 28706725 in words is "twenty-eight million, seven hundred six thousand, seven hundred twenty-five".