28700087 has 6 divisors (see below), whose sum is σ = 31077792. Its totient is φ = 26492232.

The previous prime is 28700081. The next prime is 28700099. The reversal of 28700087 is 78000782.

It is a happy number.

It is not a de Polignac number, because 28700087 - 2¹⁴ = 28683703 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 (28700081) 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, 84743 + ... + 85080.

It is an arithmetic number, because the mean of its divisors is an integer number (5179632).

Almost surely, 2^28700087 is an apocalyptic number.

28700087 is a deficient number, since it is larger than the sum of its proper divisors (2377705).

28700087 is a wasteful number, since it uses less digits than its factorization.

28700087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169849 (or 169836 counting only the distinct ones).

The product of its (nonzero) digits is 6272, while the sum is 32.

The square root of 28700087 is about 5357.2462142410. The cubic root of 28700087 is about 306.1688980300.

The spelling of 28700087 in words is "twenty-eight million, seven hundred thousand, eighty-seven".