53031440 has 80 divisors (see below), whose sum is σ = 153740160. Its totient is φ = 16527360.

The previous prime is 53031431. The next prime is 53031457. The reversal of 53031440 is 4413035.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1856 + ... + 10464.

It is an arithmetic number, because the mean of its divisors is an integer number (1921752).

Almost surely, 2^53031440 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 53031440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76870080).

53031440 is an abundant number, since it is smaller than the sum of its proper divisors (100708720).

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

53031440 is a wasteful number, since it uses less digits than its factorization.

53031440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8640 (or 8634 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 53031440 is about 7282.2688772113. The cubic root of 53031440 is about 375.7028359754.

Adding to 53031440 its reverse (4413035), we get a palindrome (57444475).

The spelling of 53031440 in words is "fifty-three million, thirty-one thousand, four hundred forty".