102028855 has 4 divisors (see below), whose sum is σ = 122434632. Its totient is φ = 81623080.

The previous prime is 102028853. The next prime is 102028867. The reversal of 102028855 is 558820201.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 102028855 - 2¹ = 102028853 is a prime.

It is a super-2 number, since 2×102028855² = 20819774505222050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (102028853) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10202881 + ... + 10202890.

It is an arithmetic number, because the mean of its divisors is an integer number (30608658).

Almost surely, 2^102028855 is an apocalyptic number.

102028855 is a deficient number, since it is larger than the sum of its proper divisors (20405777).

102028855 is an equidigital number, since it uses as much as digits as its factorization.

102028855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20405776.

The product of its (nonzero) digits is 6400, while the sum is 31.

The square root of 102028855 is about 10100.9333727136. The cubic root of 102028855 is about 467.2769275199.

The spelling of 102028855 in words is "one hundred two million, twenty-eight thousand, eight hundred fifty-five".