1101800028 has 48 divisors (see below), whose sum is σ = 2939811840. Its totient is φ = 314620224.

The previous prime is 1101799999. The next prime is 1101800053. The reversal of 1101800028 is 8200081011.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 1101799977 and 1101800013.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231925 + ... + 236627.

It is an arithmetic number, because the mean of its divisors is an integer number (61246080).

Almost surely, 2^1101800028 is an apocalyptic number.

It is an amenable number.

1101800028 is an abundant number, since it is smaller than the sum of its proper divisors (1838011812).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1101800028 is a wasteful number, since it uses less digits than its factorization.

1101800028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7506 (or 7504 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

The square root of 1101800028 is about 33193.3732543109. The cubic root of 1101800028 is about 1032.8428792410.

Adding to 1101800028 its reverse (8200081011), we get a palindrome (9301881039).

The spelling of 1101800028 in words is "one billion, one hundred one million, eight hundred thousand, twenty-eight".