52420240 has 40 divisors (see below), whose sum is σ = 128295360. Its totient is φ = 19863936.

The previous prime is 52420237. The next prime is 52420241. The reversal of 52420240 is 4202425.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (52420241) 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, 15724 + ... + 18763.

It is an arithmetic number, because the mean of its divisors is an integer number (3207384).

Almost surely, 2^52420240 is an apocalyptic number.

It is an amenable number.

52420240 is an abundant number, since it is smaller than the sum of its proper divisors (75875120).

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

52420240 is a wasteful number, since it uses less digits than its factorization.

52420240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34519 (or 34513 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 52420240 is about 7240.1823181464. The cubic root of 52420240 is about 374.2539002486.

Adding to 52420240 its reverse (4202425), we get a palindrome (56622665).

The spelling of 52420240 in words is "fifty-two million, four hundred twenty thousand, two hundred forty".