2661920 has 48 divisors (see below), whose sum is σ = 6386688. Its totient is φ = 1048320.

The previous prime is 2661917. The next prime is 2661929. The reversal of 2661920 is 291662.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 2661920.

It is not an unprimeable number, because it can be changed into a prime (2661929) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20255 + ... + 20385.

It is an arithmetic number, because the mean of its divisors is an integer number (133056).

2^2661920 is an apocalyptic number.

2661920 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 2661920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3193344).

2661920 is an abundant number, since it is smaller than the sum of its proper divisors (3724768).

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

2661920 is a wasteful number, since it uses less digits than its factorization.

2661920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273 (or 265 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 2661920 is about 1631.5391506182. The cubic root of 2661920 is about 138.5899271318.

The spelling of 2661920 in words is "two million, six hundred sixty-one thousand, nine hundred twenty".