52400520 has 128 divisors (see below), whose sum is σ = 177120000. Its totient is φ = 13950144.

The previous prime is 52400507. The next prime is 52400521. The reversal of 52400520 is 2500425.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 52400493 and 52400502.

It is not an unprimeable number, because it can be changed into a prime (52400521) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 87181 + ... + 87779.

It is an arithmetic number, because the mean of its divisors is an integer number (1383750).

Almost surely, 2^52400520 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 52400520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (88560000).

52400520 is an abundant number, since it is smaller than the sum of its proper divisors (124719480).

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

52400520 is an equidigital number, since it uses as much as digits as its factorization.

52400520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631 (or 609 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 52400520 is about 7238.8203458851. The cubic root of 52400520 is about 374.2069640997.

Adding to 52400520 its reverse (2500425), we get a palindrome (54900945).

The spelling of 52400520 in words is "fifty-two million, four hundred thousand, five hundred twenty".