6649610240 has 272 divisors, whose sum is σ = 19729855488. Its totient is φ = 2095054848.

The previous prime is 6649610213. The next prime is 6649610249. The reversal of 6649610240 is 420169466.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 6649610194 and 6649610203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6649610249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29818769 + ... + 29818991.

Almost surely, 2^6649610240 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 6649610240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9864927744).

6649610240 is an abundant number, since it is smaller than the sum of its proper divisors (13080245248).

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

6649610240 is an equidigital number, since it uses as much as digits as its factorization.

6649610240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280 (or 250 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 6649610240 is about 81545.1423445934. The cubic root of 6649610240 is about 1880.4656157724.

The spelling of 6649610240 in words is "six billion, six hundred forty-nine million, six hundred ten thousand, two hundred forty".