53287440 has 80 divisors (see below), whose sum is σ = 166060800. Its totient is φ = 14135296.

The previous prime is 53287439. The next prime is 53287441. The reversal of 53287440 is 4478235.

It is an interprime number because it is at equal distance from previous prime (53287439) and next prime (53287441).

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

It is not an unprimeable number, because it can be changed into a prime (53287441) 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, 56896 + ... + 57824.

It is an arithmetic number, because the mean of its divisors is an integer number (2075760).

Almost surely, 2^53287440 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 53287440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83030400).

53287440 is an abundant number, since it is smaller than the sum of its proper divisors (112773360).

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

53287440 is a wasteful number, since it uses less digits than its factorization.

53287440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184 (or 1178 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 33.

The square root of 53287440 is about 7299.8246554284. The cubic root of 53287440 is about 376.3064123683.

The spelling of 53287440 in words is "fifty-three million, two hundred eighty-seven thousand, four hundred forty".