28740087 has 12 divisors (see below), whose sum is σ = 43318704. Its totient is φ = 18326880.

The previous prime is 28740079. The next prime is 28740091. The reversal of 28740087 is 78004782.

It is not a de Polignac number, because 28740087 - 2³ = 28740079 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28740037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69214 + ... + 69627.

It is an arithmetic number, because the mean of its divisors is an integer number (3609892).

Almost surely, 2^28740087 is an apocalyptic number.

28740087 is a deficient number, since it is larger than the sum of its proper divisors (14578617).

28740087 is a wasteful number, since it uses less digits than its factorization.

28740087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138870 (or 138867 counting only the distinct ones).

The product of its (nonzero) digits is 25088, while the sum is 36.

The square root of 28740087 is about 5360.9781756691. The cubic root of 28740087 is about 306.3110703144.

The spelling of 28740087 in words is "twenty-eight million, seven hundred forty thousand, eighty-seven".