1021089888 has 504 divisors, whose sum is σ = 3830763888. Its totient is φ = 262020096.

The previous prime is 1021089869. The next prime is 1021089889. The reversal of 1021089888 is 8889801201.

It is a tau number, because it is divible by the number of its divisors (504).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021089889) by changing a digit.

It is a polite number, since it can be written in 83 ways as a sum of consecutive naturals, for example, 27597006 + ... + 27597042.

It is an arithmetic number, because the mean of its divisors is an integer number (7600722).

Almost surely, 2^1021089888 is an apocalyptic number.

1021089888 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021089888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1915381944).

1021089888 is an abundant number, since it is smaller than the sum of its proper divisors (2809674000).

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

1021089888 is an equidigital number, since it uses as much as digits as its factorization.

1021089888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 62 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 45.

The square root of 1021089888 is about 31954.4971482888. The cubic root of 1021089888 is about 1006.9811133132.

The spelling of 1021089888 in words is "one billion, twenty-one million, eighty-nine thousand, eight hundred eighty-eight".