28100555 has 8 divisors (see below), whose sum is σ = 38537952. Its totient is φ = 19268928.

The previous prime is 28100551. The next prime is 28100561. The reversal of 28100555 is 55500182.

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

It is not a de Polignac number, because 28100555 - 2² = 28100551 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28100551) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 401402 + ... + 401471.

It is an arithmetic number, because the mean of its divisors is an integer number (4817244).

Almost surely, 2^28100555 is an apocalyptic number.

28100555 is a deficient number, since it is larger than the sum of its proper divisors (10437397).

28100555 is an equidigital number, since it uses as much as digits as its factorization.

28100555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802885.

The product of its (nonzero) digits is 2000, while the sum is 26.

The square root of 28100555 is about 5300.9956611942. The cubic root of 28100555 is about 304.0219679127.

The spelling of 28100555 in words is "twenty-eight million, one hundred thousand, five hundred fifty-five".