2155575280 has 80 divisors (see below), whose sum is σ = 5089629600. Its totient is φ = 848931840.

The previous prime is 2155575271. The next prime is 2155575313. The reversal of 2155575280 is 825755512.

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

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1560190 + ... + 1561570.

It is an arithmetic number, because the mean of its divisors is an integer number (63620370).

Almost surely, 2^2155575280 is an apocalyptic number.

2155575280 is a gapful number since it is divisible by the number (20) 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 2155575280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2544814800).

2155575280 is an abundant number, since it is smaller than the sum of its proper divisors (2934054320).

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

2155575280 is a wasteful number, since it uses less digits than its factorization.

2155575280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1682 (or 1676 counting only the distinct ones).

The product of its (nonzero) digits is 140000, while the sum is 40.

The square root of 2155575280 is about 46428.1733433483. The cubic root of 2155575280 is about 1291.7775467123. Note that the first 3 decimals are identical.

The spelling of 2155575280 in words is "two billion, one hundred fifty-five million, five hundred seventy-five thousand, two hundred eighty".