28031087 has 6 divisors (see below), whose sum is σ = 32607648. Its totient is φ = 24026604.

The previous prime is 28031083. The next prime is 28031131. The reversal of 28031087 is 78013082.

It is not a de Polignac number, because 28031087 - 2² = 28031083 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 (28031083) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 285983 + ... + 286080.

It is an arithmetic number, because the mean of its divisors is an integer number (5434608).

Almost surely, 2^28031087 is an apocalyptic number.

28031087 is a deficient number, since it is larger than the sum of its proper divisors (4576561).

28031087 is an equidigital number, since it uses as much as digits as its factorization.

28031087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 572077 (or 572070 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 28031087 is about 5294.4392526499. The cubic root of 28031087 is about 303.7712347204.

The spelling of 28031087 in words is "twenty-eight million, thirty-one thousand, eighty-seven".