52661840 has 160 divisors (see below), whose sum is σ = 155990016. Its totient is φ = 16058880.

The previous prime is 52661837. The next prime is 52661857. The reversal of 52661840 is 4816625.

It is a junction number, because it is equal to n+sod(n) for n = 52661797 and 52661806.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 511229 + ... + 511331.

Almost surely, 2^52661840 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 52661840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77995008).

52661840 is an abundant number, since it is smaller than the sum of its proper divisors (103328176).

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

52661840 is a wasteful number, since it uses less digits than its factorization.

52661840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 217 (or 211 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 52661840 is about 7256.8478005261. The cubic root of 52661840 is about 374.8279862940.

The spelling of 52661840 in words is "fifty-two million, six hundred sixty-one thousand, eight hundred forty".