2521853640 has 96 divisors (see below), whose sum is σ = 8245298880. Its totient is φ = 668451456.

The previous prime is 2521853639. The next prime is 2521853681. The reversal of 2521853640 is 463581252.

2521853640 is a `hidden beast` number, since 2 + 5 + 2 + 1 + 8 + 5 + 3 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 2521853595 and 2521853604.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39147 + ... + 81093.

It is an arithmetic number, because the mean of its divisors is an integer number (85888530).

Almost surely, 2^2521853640 is an apocalyptic number.

2521853640 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 2521853640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4122649440).

2521853640 is an abundant number, since it is smaller than the sum of its proper divisors (5723445240).

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

2521853640 is a wasteful number, since it uses less digits than its factorization.

2521853640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42131 (or 42124 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 2521853640 is about 50218.0608944631. The cubic root of 2521853640 is about 1361.1520011311.

The spelling of 2521853640 in words is "two billion, five hundred twenty-one million, eight hundred fifty-three thousand, six hundred forty".