2621949720 has 128 divisors (see below), whose sum is σ = 8502278400. Its totient is φ = 643014144.

The previous prime is 2621949643. The next prime is 2621949727. The reversal of 2621949720 is 279491262.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2621949727) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 438511 + ... + 444449.

It is an arithmetic number, because the mean of its divisors is an integer number (66424050).

Almost surely, 2^2621949720 is an apocalyptic number.

2621949720 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 2621949720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4251139200).

2621949720 is an abundant number, since it is smaller than the sum of its proper divisors (5880328680).

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

2621949720 is a wasteful number, since it uses less digits than its factorization.

2621949720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6249 (or 6245 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 42.

The square root of 2621949720 is about 51204.9774924274. The cubic root of 2621949720 is about 1378.9275641921.

The spelling of 2621949720 in words is "two billion, six hundred twenty-one million, nine hundred forty-nine thousand, seven hundred twenty".