53431840 has 96 divisors (see below), whose sum is σ = 157417344. Its totient is φ = 16650240.

The previous prime is 53431823. The next prime is 53431849. The reversal of 53431840 is 4813435.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 53431799 and 53431808.

It is not an unprimeable number, because it can be changed into a prime (53431849) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10152 + ... + 14488.

It is an arithmetic number, because the mean of its divisors is an integer number (1639764).

Almost surely, 2^53431840 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 53431840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78708672).

53431840 is an abundant number, since it is smaller than the sum of its proper divisors (103985504).

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

53431840 is a wasteful number, since it uses less digits than its factorization.

53431840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370 (or 4362 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 28.

The square root of 53431840 is about 7309.7086125235. The cubic root of 53431840 is about 376.6460148265.

The spelling of 53431840 in words is "fifty-three million, four hundred thirty-one thousand, eight hundred forty".