2631660 has 48 divisors (see below), whose sum is σ = 7693056. Its totient is φ = 670912.

The previous prime is 2631653. The next prime is 2631661. The reversal of 2631660 is 661362.

2631660 = T₃₁₅ + T₃₁₆ + ... + T₃₆₀.

2631660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 2631660.

It is not an unprimeable number, because it can be changed into a prime (2631661) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 427 + ... + 2333.

It is an arithmetic number, because the mean of its divisors is an integer number (160272).

2^2631660 is an apocalyptic number.

2631660 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 2631660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3846528).

2631660 is an abundant number, since it is smaller than the sum of its proper divisors (5061396).

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

2631660 is a wasteful number, since it uses less digits than its factorization.

2631660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942 (or 1940 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 24.

The square root of 2631660 is about 1622.2391932141. The cubic root of 2631660 is about 138.0627733737.

The spelling of 2631660 in words is "two million, six hundred thirty-one thousand, six hundred sixty".