28381955 has 8 divisors (see below), whose sum is σ = 38923872. Its totient is φ = 19461888.

The previous prime is 28381939. The next prime is 28381973. The reversal of 28381955 is 55918382.

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

It is a cyclic number.

It is not a de Polignac number, because 28381955 - 2⁴ = 28381939 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 405422 + ... + 405491.

It is an arithmetic number, because the mean of its divisors is an integer number (4865484).

Almost surely, 2^28381955 is an apocalyptic number.

28381955 is a deficient number, since it is larger than the sum of its proper divisors (10541917).

28381955 is an equidigital number, since it uses as much as digits as its factorization.

28381955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810925.

The product of its digits is 86400, while the sum is 41.

The square root of 28381955 is about 5327.4717268138. The cubic root of 28381955 is about 305.0334282093.

The spelling of 28381955 in words is "twenty-eight million, three hundred eighty-one thousand, nine hundred fifty-five".