2620721328 has 80 divisors (see below), whose sum is σ = 6887059200. Its totient is φ = 858574080.

The previous prime is 2620721293. The next prime is 2620721339. The reversal of 2620721328 is 8231270262.

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, 1290618 + ... + 1292646.

It is an arithmetic number, because the mean of its divisors is an integer number (86088240).

Almost surely, 2^2620721328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2620721328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3443529600).

2620721328 is an abundant number, since it is smaller than the sum of its proper divisors (4266337872).

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

2620721328 is a wasteful number, since it uses less digits than its factorization.

2620721328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2490 (or 2484 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 2620721328 is about 51192.9812376658. The cubic root of 2620721328 is about 1378.7121865324.

The spelling of 2620721328 in words is "two billion, six hundred twenty million, seven hundred twenty-one thousand, three hundred twenty-eight".