1027891220 has 54 divisors (see below), whose sum is σ = 2211940458. Its totient is φ = 401234592.

The previous prime is 1027891201. The next prime is 1027891223. The reversal of 1027891220 is 221987201.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 822312976 + 205578244 = 28676^2 + 14338^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1027891223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9606407 + ... + 9606513.

Almost surely, 2^1027891220 is an apocalyptic number.

1027891220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1027891220 is an abundant number, since it is smaller than the sum of its proper divisors (1184049238).

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

1027891220 is an equidigital number, since it uses as much as digits as its factorization.

1027891220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 357 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 1027891220 is about 32060.7426613920. The cubic root of 1027891220 is about 1009.2119526854.

The spelling of 1027891220 in words is "one billion, twenty-seven million, eight hundred ninety-one thousand, two hundred twenty".