1089775920 has 80 divisors (see below), whose sum is σ = 3494820960. Its totient is φ = 280584192.

The previous prime is 1089775889. The next prime is 1089775931. The reversal of 1089775920 is 295779801.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×1089775920² = 2375223111623692800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 1089775920.

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, 71329 + ... + 85248.

It is an arithmetic number, because the mean of its divisors is an integer number (43685262).

Almost surely, 2^1089775920 is an apocalyptic number.

1089775920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1089775920 is an abundant number, since it is smaller than the sum of its proper divisors (2405045040).

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

1089775920 is a wasteful number, since it uses less digits than its factorization.

1089775920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156622 (or 156616 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 48.

The square root of 1089775920 is about 33011.7542702596. The cubic root of 1089775920 is about 1029.0719387279.

The spelling of 1089775920 in words is "one billion, eighty-nine million, seven hundred seventy-five thousand, nine hundred twenty".