2640630 has 64 divisors (see below), whose sum is σ = 6842880. Its totient is φ = 650496.

The previous prime is 2640581. The next prime is 2640643. The reversal of 2640630 is 360462.

2640630 = 811² + 812² + ... + 814².

2640630 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2640597 and 2640606.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 29626 + ... + 29714.

It is an arithmetic number, because the mean of its divisors is an integer number (106920).

2^2640630 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2640630, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3421440).

2640630 is an abundant number, since it is smaller than the sum of its proper divisors (4202250).

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

2640630 is a wasteful number, since it uses less digits than its factorization.

2640630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165.

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 2640630 is about 1625.0015384608. The cubic root of 2640630 is about 138.2194575810.

The spelling of 2640630 in words is "two million, six hundred forty thousand, six hundred thirty".