53133840 has 160 divisors (see below), whose sum is σ = 193916160. Its totient is φ = 13326336.

The previous prime is 53133803. The next prime is 53133917. The reversal of 53133840 is 4833135.

It is a happy number.

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 31 ways as a sum of consecutive naturals, for example, 35997 + ... + 37443.

It is an arithmetic number, because the mean of its divisors is an integer number (1211976).

Almost surely, 2^53133840 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 53133840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96958080).

53133840 is an abundant number, since it is smaller than the sum of its proper divisors (140782320).

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

53133840 is a wasteful number, since it uses less digits than its factorization.

53133840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486 (or 1474 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 53133840 is about 7289.2962623288. The cubic root of 53133840 is about 375.9444991265.

Adding to 53133840 its reverse (4833135), we get a palindrome (57966975).

The spelling of 53133840 in words is "fifty-three million, one hundred thirty-three thousand, eight hundred forty".