2660044640 has 72 divisors (see below), whose sum is σ = 6907647600. Its totient is φ = 967281920.

The previous prime is 2660044627. The next prime is 2660044643. The reversal of 2660044640 is 464400662.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 2660044597 and 2660044606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2660044643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 49340 + ... + 88059.

It is an arithmetic number, because the mean of its divisors is an integer number (95939550).

Almost surely, 2^2660044640 is an apocalyptic number.

2660044640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2660044640 is an abundant number, since it is smaller than the sum of its proper divisors (4247602960).

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

2660044640 is a wasteful number, since it uses less digits than its factorization.

2660044640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137436 (or 137417 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 32.

The square root of 2660044640 is about 51575.6205973326. The cubic root of 2660044640 is about 1385.5737330278.

The spelling of 2660044640 in words is "two billion, six hundred sixty million, forty-four thousand, six hundred forty".