525256640 has 56 divisors (see below), whose sum is σ = 1264889520. Its totient is φ = 207730688.

The previous prime is 525256607. The next prime is 525256643. The reversal of 525256640 is 46652525.

It is a self number, because there is not a number n which added to its sum of digits gives 525256640.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525256643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19259 + ... + 37701.

Almost surely, 2^525256640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 525256640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (632444760).

525256640 is an abundant number, since it is smaller than the sum of its proper divisors (739632880).

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

525256640 is a wasteful number, since it uses less digits than its factorization.

525256640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18549 (or 18539 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 35.

The square root of 525256640 is about 22918.4781344661. The cubic root of 525256640 is about 806.8457524964.

The spelling of 525256640 in words is "five hundred twenty-five million, two hundred fifty-six thousand, six hundred forty".