52557640 has 32 divisors (see below), whose sum is σ = 118573560. Its totient is φ = 20966400.

The previous prime is 52557623. The next prime is 52557641. The reversal of 52557640 is 4675525.

52557640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 6832996 + 45724644 = 2614^2 + 6762^2 .

It is a junction number, because it is equal to n+sod(n) for n = 52557596 and 52557605.

It is not an unprimeable number, because it can be changed into a prime (52557641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15280 + ... + 18400.

Almost surely, 2^52557640 is an apocalyptic number.

It is an amenable number.

52557640 is an abundant number, since it is smaller than the sum of its proper divisors (66015920).

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

52557640 is a wasteful number, since it uses less digits than its factorization.

52557640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3553 (or 3549 counting only the distinct ones).

The product of its (nonzero) digits is 42000, while the sum is 34.

The square root of 52557640 is about 7249.6648198382. The cubic root of 52557640 is about 374.5806037188.

The spelling of 52557640 in words is "fifty-two million, five hundred fifty-seven thousand, six hundred forty".