2155780480 has 96 divisors (see below), whose sum is σ = 5995164240. Its totient is φ = 739113984.

The previous prime is 2155780463. The next prime is 2155780481. The reversal of 2155780480 is 840875512.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2155780481) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3012 + ... + 65731.

Almost surely, 2^2155780480 is an apocalyptic number.

2155780480 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 2155780480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2997582120).

2155780480 is an abundant number, since it is smaller than the sum of its proper divisors (3839383760).

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

2155780480 is an equidigital number, since it uses as much as digits as its factorization.

2155780480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68776 (or 68757 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 40.

The square root of 2155780480 is about 46430.3831558603. The cubic root of 2155780480 is about 1291.8185356684.

The spelling of 2155780480 in words is "two billion, one hundred fifty-five million, seven hundred eighty thousand, four hundred eighty".