2621039616 has 264 divisors, whose sum is σ = 8261757504. Its totient is φ = 795525120.

The previous prime is 2621039611. The next prime is 2621039623. The reversal of 2621039616 is 6169301262.

It is a happy number.

2621039616 is a `hidden beast` number, since 2 + 6 + 2 + 1 + 0 + 39 + 616 = 666.

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

It is not an unprimeable number, because it can be changed into a prime (2621039611) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15694765 + ... + 15694931.

It is an arithmetic number, because the mean of its divisors is an integer number (31294536).

Almost surely, 2^2621039616 is an apocalyptic number.

2621039616 is a gapful number since it is divisible by the number (26) 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 2621039616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4130878752).

2621039616 is an abundant number, since it is smaller than the sum of its proper divisors (5640717888).

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

2621039616 is a wasteful number, since it uses less digits than its factorization.

2621039616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337 (or 316 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 2621039616 is about 51196.0898506907. The cubic root of 2621039616 is about 1378.7679993825.

The spelling of 2621039616 in words is "two billion, six hundred twenty-one million, thirty-nine thousand, six hundred sixteen".