52506840 has 32 divisors (see below), whose sum is σ = 157520880. Its totient is φ = 14001792.

The previous prime is 52506821. The next prime is 52506841. The reversal of 52506840 is 4860525.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 52506798 and 52506807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (52506841) 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, 218659 + ... + 218898.

Almost surely, 2^52506840 is an apocalyptic number.

It is an amenable number.

52506840 is an abundant number, since it is smaller than the sum of its proper divisors (105014040).

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

52506840 is a wasteful number, since it uses less digits than its factorization.

52506840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437571 (or 437567 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 52506840 is about 7246.1603625644. The cubic root of 52506840 is about 374.4598802062.

It can be divided in two parts, 5250 and 6840, that added together give a triangular number (12090 = T₁₅₅).

The spelling of 52506840 in words is "fifty-two million, five hundred six thousand, eight hundred forty".