28387955 has 24 divisors (see below), whose sum is σ = 36331152. Its totient is φ = 21280896.

The previous prime is 28387951. The next prime is 28387981. The reversal of 28387955 is 55978382.

It is not a de Polignac number, because 28387955 - 2² = 28387951 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28387951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 180737 + ... + 180893.

It is an arithmetic number, because the mean of its divisors is an integer number (1513798).

Almost surely, 2^28387955 is an apocalyptic number.

28387955 is a deficient number, since it is larger than the sum of its proper divisors (7943197).

28387955 is a wasteful number, since it uses less digits than its factorization.

28387955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 263 (or 234 counting only the distinct ones).

The product of its digits is 604800, while the sum is 47.

The square root of 28387955 is about 5328.0348159523. The cubic root of 28387955 is about 305.0549215797.

The spelling of 28387955 in words is "twenty-eight million, three hundred eighty-seven thousand, nine hundred fifty-five".