2640606440 has 32 divisors (see below), whose sum is σ = 6025052160. Its totient is φ = 1041364800.

The previous prime is 2640606427. The next prime is 2640606461. The reversal of 2640606440 is 446060462.

2640606440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 2640606397 and 2640606406.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 462056 + ... + 467735.

It is an arithmetic number, because the mean of its divisors is an integer number (188282880).

Almost surely, 2^2640606440 is an apocalyptic number.

2640606440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640606440 is an abundant number, since it is smaller than the sum of its proper divisors (3384445720).

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

2640606440 is a wasteful number, since it uses less digits than its factorization.

2640606440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 929873 (or 929869 counting only the distinct ones).

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

The square root of 2640606440 is about 51386.8313870392. The cubic root of 2640606440 is about 1382.1904650986.

The spelling of 2640606440 in words is "two billion, six hundred forty million, six hundred six thousand, four hundred forty".