2640443454 has 64 divisors (see below), whose sum is σ = 6408000000. Its totient is φ = 799269120.

The previous prime is 2640443441. The next prime is 2640443459. The reversal of 2640443454 is 4543440462.

2640443454 is a `hidden beast` number, since 2 + 640 + 4 + 4 + 3 + 4 + 5 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640443459) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 740127 + ... + 743685.

It is an arithmetic number, because the mean of its divisors is an integer number (100125000).

Almost surely, 2^2640443454 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2640443454, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3204000000).

2640443454 is an abundant number, since it is smaller than the sum of its proper divisors (3767556546).

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

2640443454 is a wasteful number, since it uses less digits than its factorization.

2640443454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4830 (or 4824 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 36.

The square root of 2640443454 is about 51385.2454893426. The cubic root of 2640443454 is about 1382.1620268925.

The spelling of 2640443454 in words is "two billion, six hundred forty million, four hundred forty-three thousand, four hundred fifty-four".