28260157 has 4 divisors (see below), whose sum is σ = 28440316. Its totient is φ = 28080000.

The previous prime is 28260109. The next prime is 28260161. The reversal of 28260157 is 75106282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 20921476 + 7338681 = 4574^2 + 2709^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28260157 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28260257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89844 + ... + 90157.

It is an arithmetic number, because the mean of its divisors is an integer number (7110079).

Almost surely, 2^28260157 is an apocalyptic number.

It is an amenable number.

28260157 is a deficient number, since it is larger than the sum of its proper divisors (180159).

28260157 is a wasteful number, since it uses less digits than its factorization.

28260157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180158.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 28260157 is about 5316.0283106846. The cubic root of 28260157 is about 304.5964635513.

The spelling of 28260157 in words is "twenty-eight million, two hundred sixty thousand, one hundred fifty-seven".