2640256494 has 8 divisors (see below), whose sum is σ = 5280513000. Its totient is φ = 880085496.

The previous prime is 2640256469. The next prime is 2640256499. The reversal of 2640256494 is 4946520462.

It is a sphenic number, since it is the product of 3 distinct primes.

2640256494 is an admirable number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640256499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220021369 + ... + 220021380.

It is an arithmetic number, because the mean of its divisors is an integer number (660064125).

Almost surely, 2^2640256494 is an apocalyptic number.

2640256494 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

2640256494 is a wasteful number, since it uses less digits than its factorization.

2640256494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 440042754.

The product of its (nonzero) digits is 414720, while the sum is 42.

The square root of 2640256494 is about 51383.4262578898. The cubic root of 2640256494 is about 1382.1294042016.

The spelling of 2640256494 in words is "two billion, six hundred forty million, two hundred fifty-six thousand, four hundred ninety-four".