28725161 has 8 divisors (see below), whose sum is σ = 29551104. Its totient is φ = 27906480.

The previous prime is 28725149. The next prime is 28725181. The reversal of 28725161 is 16152782.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28725161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28725101) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6776 + ... + 10166.

It is an arithmetic number, because the mean of its divisors is an integer number (3693888).

Almost surely, 2^28725161 is an apocalyptic number.

It is an amenable number.

28725161 is a deficient number, since it is larger than the sum of its proper divisors (825943).

28725161 is a wasteful number, since it uses less digits than its factorization.

28725161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3631.

The product of its digits is 6720, while the sum is 32.

The square root of 28725161 is about 5359.5858981828. The cubic root of 28725161 is about 306.2580341638.

The spelling of 28725161 in words is "twenty-eight million, seven hundred twenty-five thousand, one hundred sixty-one".