52640730 has 24 divisors (see below), whose sum is σ = 136866132. Its totient is φ = 14037504.

The previous prime is 52640723. The next prime is 52640747. The reversal of 52640730 is 3704625.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 50083929 + 2556801 = 7077^2 + 1599^2 .

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 52640694 and 52640703.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 292359 + ... + 292538.

Almost surely, 2^52640730 is an apocalyptic number.

52640730 is an abundant number, since it is smaller than the sum of its proper divisors (84225402).

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

52640730 is a wasteful number, since it uses less digits than its factorization.

52640730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 584910 (or 584907 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 52640730 is about 7255.3931664659. The cubic root of 52640730 is about 374.7778951445. Note that the first 3 decimals are identical.

The spelling of 52640730 in words is "fifty-two million, six hundred forty thousand, seven hundred thirty".