28121087 has 8 divisors (see below), whose sum is σ = 28793856. Its totient is φ = 27451512.

The previous prime is 28121081. The next prime is 28121089. The reversal of 28121087 is 78012182.

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

It is a cyclic number.

It is not a de Polignac number, because 28121087 - 2⁸ = 28120831 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 (28121081) 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, 33758 + ... + 34580.

It is an arithmetic number, because the mean of its divisors is an integer number (3599232).

Almost surely, 2^28121087 is an apocalyptic number.

28121087 is a deficient number, since it is larger than the sum of its proper divisors (672769).

28121087 is an equidigital number, since it uses as much as digits as its factorization.

28121087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1597.

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 28121087 is about 5302.9319248883. The cubic root of 28121087 is about 304.0959956245.

The spelling of 28121087 in words is "twenty-eight million, one hundred twenty-one thousand, eighty-seven".