2647990920 has 128 divisors (see below), whose sum is σ = 8330480640. Its totient is φ = 672080640.

The previous prime is 2647990867. The next prime is 2647990921. The reversal of 2647990920 is 290997462.

It is a self number, because there is not a number n which added to its sum of digits gives 2647990920.

It is not an unprimeable number, because it can be changed into a prime (2647990921) 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, 580087 + ... + 584633.

It is an arithmetic number, because the mean of its divisors is an integer number (65081880).

Almost surely, 2^2647990920 is an apocalyptic number.

2647990920 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 2647990920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4165240320).

2647990920 is an abundant number, since it is smaller than the sum of its proper divisors (5682489720).

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

2647990920 is a wasteful number, since it uses less digits than its factorization.

2647990920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4795 (or 4791 counting only the distinct ones).

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 2647990920 is about 51458.6330949434. The cubic root of 2647990920 is about 1383.4777020018.

The spelling of 2647990920 in words is "two billion, six hundred forty-seven million, nine hundred ninety thousand, nine hundred twenty".