2640689046 has 64 divisors (see below), whose sum is σ = 6194764800. Its totient is φ = 831511008.

The previous prime is 2640689011. The next prime is 2640689063. The reversal of 2640689046 is 6409860462.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2640688992 and 2640689010.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 373036 + ... + 380048.

It is an arithmetic number, because the mean of its divisors is an integer number (96793200).

Almost surely, 2^2640689046 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2640689046, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3097382400).

2640689046 is an abundant number, since it is smaller than the sum of its proper divisors (3554075754).

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

2640689046 is a wasteful number, since it uses less digits than its factorization.

2640689046 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7410 (or 7404 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The square root of 2640689046 is about 51387.6351469884. The cubic root of 2640689046 is about 1382.2048779538.

The spelling of 2640689046 in words is "two billion, six hundred forty million, six hundred eighty-nine thousand, forty-six".