1091090028 has 48 divisors (see below), whose sum is σ = 2922441984. Its totient is φ = 310361280.

The previous prime is 1091090027. The next prime is 1091090051. The reversal of 1091090028 is 8200901901.

It is a junction number, because it is equal to n+sod(n) for n = 1091089977 and 1091090004.

It is not an unprimeable number, because it can be changed into a prime (1091090023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9543 + ... + 47678.

It is an arithmetic number, because the mean of its divisors is an integer number (60884208).

Almost surely, 2^1091090028 is an apocalyptic number.

It is an amenable number.

1091090028 is an abundant number, since it is smaller than the sum of its proper divisors (1831351956).

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

1091090028 is a wasteful number, since it uses less digits than its factorization.

1091090028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57462 (or 57460 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 1091090028 is about 33031.6519114621. The cubic root of 1091090028 is about 1029.4854085810.

Adding to 1091090028 its reverse (8200901901), we get a palindrome (9291991929).

The spelling of 1091090028 in words is "one billion, ninety-one million, ninety thousand, twenty-eight".