2620666620 has 576 divisors, whose sum is σ = 10164196224. Its totient is φ = 536739840.

The previous prime is 2620666597. The next prime is 2620666669. The reversal of 2620666620 is 266660262.

It is a happy number.

2620666620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 23191684 + ... + 23191796.

It is an arithmetic number, because the mean of its divisors is an integer number (17646174).

Almost surely, 2^2620666620 is an apocalyptic number.

2620666620 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 2620666620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5082098112).

2620666620 is an abundant number, since it is smaller than the sum of its proper divisors (7543529604).

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

2620666620 is a wasteful number, since it uses less digits than its factorization.

2620666620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 2620666620 is about 51192.4469038158. The cubic root of 2620666620 is about 1378.7025928491.

The spelling of 2620666620 in words is "two billion, six hundred twenty million, six hundred sixty-six thousand, six hundred twenty".