2640206907 has 28 divisors (see below), whose sum is σ = 4263014784. Its totient is φ = 1624736880.

The previous prime is 2640206897. The next prime is 2640206911. The reversal of 2640206907 is 7096020462.

It is a happy number.

2640206907 is a `hidden beast` number, since 2 + 640 + 2 + 0 + 6 + 9 + 0 + 7 = 666.

It is not a de Polignac number, because 2640206907 - 2⁸ = 2640206651 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2640206927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 129819 + ... + 148772.

It is an arithmetic number, because the mean of its divisors is an integer number (152250528).

Almost surely, 2^2640206907 is an apocalyptic number.

2640206907 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

2640206907 is a deficient number, since it is larger than the sum of its proper divisors (1622807877).

2640206907 is an equidigital number, since it uses as much as digits as its factorization.

2640206907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278622 (or 278607 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 36.

The square root of 2640206907 is about 51382.9437362244. The cubic root of 2640206907 is about 1382.1207514969.

The spelling of 2640206907 in words is "two billion, six hundred forty million, two hundred six thousand, nine hundred seven".