525639640 has 64 divisors (see below), whose sum is σ = 1201858560. Its totient is φ = 206878080.

The previous prime is 525639593. The next prime is 525639641. The reversal of 525639640 is 46936525.

It is a super-2 number, since 2×525639640² = 552594062278659200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 525639593 and 525639602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (525639641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 817159 + ... + 817801.

It is an arithmetic number, because the mean of its divisors is an integer number (18779040).

Almost surely, 2^525639640 is an apocalyptic number.

It is an amenable number.

525639640 is an abundant number, since it is smaller than the sum of its proper divisors (676218920).

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

525639640 is a wasteful number, since it uses less digits than its factorization.

525639640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 952 (or 948 counting only the distinct ones).

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 525639640 is about 22926.8323149972. The cubic root of 525639640 is about 807.0418133807.

The spelling of 525639640 in words is "five hundred twenty-five million, six hundred thirty-nine thousand, six hundred forty".