2640891446 has 4 divisors (see below), whose sum is σ = 3961337172. Its totient is φ = 1320445722.

The previous prime is 2640891443. The next prime is 2640891479. The reversal of 2640891446 is 6441980462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6441980462 = 2 ⋅3220990231.

It is a junction number, because it is equal to n+sod(n) for n = 2640891397 and 2640891406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640891443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660222860 + ... + 660222863.

It is an arithmetic number, because the mean of its divisors is an integer number (990334293).

Almost surely, 2^2640891446 is an apocalyptic number.

2640891446 is a deficient number, since it is larger than the sum of its proper divisors (1320445726).

2640891446 is a wasteful number, since it uses less digits than its factorization.

2640891446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1320445725.

The product of its (nonzero) digits is 331776, while the sum is 44.

The square root of 2640891446 is about 51389.6044545976. The cubic root of 2640891446 is about 1382.2401908482.

The spelling of 2640891446 in words is "two billion, six hundred forty million, eight hundred ninety-one thousand, four hundred forty-six".