2563739640 has 256 divisors, whose sum is σ = 10654848000. Its totient is φ = 532707840.

The previous prime is 2563739627. The next prime is 2563739641. The reversal of 2563739640 is 469373652.

2563739640 is a `hidden beast` number, since 2 + 5 + 637 + 3 + 9 + 6 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2563739641) 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 63 ways as a sum of consecutive naturals, for example, 67746 + ... + 98574.

It is an arithmetic number, because the mean of its divisors is an integer number (41620500).

Almost surely, 2^2563739640 is an apocalyptic number.

2563739640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2563739640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5327424000).

2563739640 is an abundant number, since it is smaller than the sum of its proper divisors (8091108360).

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

2563739640 is a wasteful number, since it uses less digits than its factorization.

2563739640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30867 (or 30857 counting only the distinct ones).

The product of its (nonzero) digits is 816480, while the sum is 45.

The square root of 2563739640 is about 50633.3846389909. The cubic root of 2563739640 is about 1368.6465472570.

The spelling of 2563739640 in words is "two billion, five hundred sixty-three million, seven hundred thirty-nine thousand, six hundred forty".