2621601620 has 48 divisors (see below), whose sum is σ = 6359145408. Its totient is φ = 897231360.

The previous prime is 2621601611. The next prime is 2621601643. The reversal of 2621601620 is 261061262.

It is a self number, because there is not a number n which added to its sum of digits gives 2621601620.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 346742 + ... + 354221.

It is an arithmetic number, because the mean of its divisors is an integer number (132482196).

Almost surely, 2^2621601620 is an apocalyptic number.

2621601620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2621601620 is an abundant number, since it is smaller than the sum of its proper divisors (3737543788).

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

2621601620 is a wasteful number, since it uses less digits than its factorization.

2621601620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 701000 (or 700998 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

The square root of 2621601620 is about 51201.5782959862. The cubic root of 2621601620 is about 1378.8665376050.

Adding to 2621601620 its reverse (261061262), we get a palindrome (2882662882).

The spelling of 2621601620 in words is "two billion, six hundred twenty-one million, six hundred one thousand, six hundred twenty".