28260987 has 8 divisors (see below), whose sum is σ = 39897936. Its totient is φ = 17732352.

The previous prime is 28260949. The next prime is 28261003. The reversal of 28260987 is 78906282.

It is a happy number.

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

It is not a de Polignac number, because 28260987 - 2²² = 24066683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28260787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277018 + ... + 277119.

It is an arithmetic number, because the mean of its divisors is an integer number (4987242).

Almost surely, 2^28260987 is an apocalyptic number.

28260987 is a deficient number, since it is larger than the sum of its proper divisors (11636949).

28260987 is a wasteful number, since it uses less digits than its factorization.

28260987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 554157.

The product of its (nonzero) digits is 96768, while the sum is 42.

The square root of 28260987 is about 5316.1063759109. The cubic root of 28260987 is about 304.5994455186.

The spelling of 28260987 in words is "twenty-eight million, two hundred sixty thousand, nine hundred eighty-seven".