2155632880 has 20 divisors (see below), whose sum is σ = 5011846632. Its totient is φ = 862253120.

The previous prime is 2155632877. The next prime is 2155632931. The reversal of 2155632880 is 882365512.

It is a tau number, because it is divible by the number of its divisors (20).

It is a super-2 number, since 2×2155632880² = 9293506226674188800, which contains 22 as substring.

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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13472626 + ... + 13472785.

Almost surely, 2^2155632880 is an apocalyptic number.

2155632880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2155632880 is an abundant number, since it is smaller than the sum of its proper divisors (2856213752).

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

2155632880 is a wasteful number, since it uses less digits than its factorization.

2155632880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26945424 (or 26945418 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 2155632880 is about 46428.7936522154. The cubic root of 2155632880 is about 1291.7890526468.

It can be divided in two parts, 2155632 and 880, that added together give a palindrome (2156512).

The spelling of 2155632880 in words is "two billion, one hundred fifty-five million, six hundred thirty-two thousand, eight hundred eighty".