2155505280 has 64 divisors (see below), whose sum is σ = 6870679200. Its totient is φ = 574800896.

The previous prime is 2155505279. The next prime is 2155505311. The reversal of 2155505280 is 825055512.

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 559410 + ... + 563249.

Almost surely, 2^2155505280 is an apocalyptic number.

2155505280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155505280 is an abundant number, since it is smaller than the sum of its proper divisors (4715173920).

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

2155505280 is a wasteful number, since it uses less digits than its factorization.

2155505280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122681 (or 1122669 counting only the distinct ones).

The product of its (nonzero) digits is 20000, while the sum is 33.

The square root of 2155505280 is about 46427.4194846106. The cubic root of 2155505280 is about 1291.7635635298.

The spelling of 2155505280 in words is "two billion, one hundred fifty-five million, five hundred five thousand, two hundred eighty".