28087157 has 4 divisors (see below), whose sum is σ = 32099616. Its totient is φ = 24074700.

The previous prime is 28087141. The next prime is 28087159. The reversal of 28087157 is 75178082.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28087157 - 2⁴ = 28087141 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28087157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28087159) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2006219 + ... + 2006232.

It is an arithmetic number, because the mean of its divisors is an integer number (8024904).

Almost surely, 2^28087157 is an apocalyptic number.

It is an amenable number.

28087157 is a deficient number, since it is larger than the sum of its proper divisors (4012459).

28087157 is an equidigital number, since it uses as much as digits as its factorization.

28087157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4012458.

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 28087157 is about 5299.7317856661. The cubic root of 28087157 is about 303.9736422496.

The spelling of 28087157 in words is "twenty-eight million, eighty-seven thousand, one hundred fifty-seven".