2640915140 has 24 divisors (see below), whose sum is σ = 5547158232. Its totient is φ = 1056130560.

The previous prime is 2640915103. The next prime is 2640915149. The reversal of 2640915140 is 415190462.

It can be written as a sum of positive squares in 4 ways, for example, as 181548676 + 2459366464 = 13474^2 + 49592^2 .

It is a junction number, because it is equal to n+sod(n) for n = 2640915097 and 2640915106.

It is not an unprimeable number, because it can be changed into a prime (2640915149) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98462 + ... + 122378.

It is an arithmetic number, because the mean of its divisors is an integer number (231131593).

Almost surely, 2^2640915140 is an apocalyptic number.

2640915140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2640915140 is an abundant number, since it is smaller than the sum of its proper divisors (2906243092).

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

2640915140 is a wasteful number, since it uses less digits than its factorization.

2640915140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29447 (or 29445 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 2640915140 is about 51389.8349870867. The cubic root of 2640915140 is about 1382.2443246419.

The spelling of 2640915140 in words is "two billion, six hundred forty million, nine hundred fifteen thousand, one hundred forty".