2640220628 has 12 divisors (see below), whose sum is σ = 4621043700. Its totient is φ = 1319922432.

The previous prime is 2640220619. The next prime is 2640220631. The reversal of 2640220628 is 8260220462.

It can be written as a sum of positive squares in 2 ways, for example, as 59783824 + 2580436804 = 7732^2 + 50798^2 .

It is a super-3 number, since 3×2640220628³ (a number of 29 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2640220594 and 2640220603.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12551 + ... + 73742.

It is an arithmetic number, because the mean of its divisors is an integer number (385086975).

Almost surely, 2^2640220628 is an apocalyptic number.

It is an amenable number.

2640220628 is a deficient number, since it is larger than the sum of its proper divisors (1980823072).

2640220628 is a wasteful number, since it uses less digits than its factorization.

2640220628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93946 (or 93944 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 2640220628 is about 51383.0772531190. The cubic root of 2640220628 is about 1382.1231457595.

The spelling of 2640220628 in words is "two billion, six hundred forty million, two hundred twenty thousand, six hundred twenty-eight".