52161840 has 320 divisors, whose sum is σ = 199987200. Its totient is φ = 12441600.

The previous prime is 52161833. The next prime is 52161877. The reversal of 52161840 is 4816125.

52161840 is a `hidden beast` number, since 5 + 2 + 1 + 618 + 40 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1272220 + ... + 1272260.

It is an arithmetic number, because the mean of its divisors is an integer number (624960).

Almost surely, 2^52161840 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 52161840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99993600).

52161840 is an abundant number, since it is smaller than the sum of its proper divisors (147825360).

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

52161840 is a wasteful number, since it uses less digits than its factorization.

52161840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113 (or 101 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 52161840 is about 7222.3154182021. The cubic root of 52161840 is about 373.6379387609.

Adding to 52161840 its reverse (4816125), we get a palindrome (56977965).

It can be divided in two parts, 5216 and 1840, that added together give a square (7056 = 84²).

The spelling of 52161840 in words is "fifty-two million, one hundred sixty-one thousand, eight hundred forty".