53317440 has 420 divisors, whose sum is σ = 220731588. Its totient is φ = 12165120.

The previous prime is 53317421. The next prime is 53317441. The reversal of 53317440 is 4471335.

It can be written as a sum of positive squares in 2 ways, for example, as 30735936 + 22581504 = 5544^2 + 4752^2 .

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53317441) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 3136312 + ... + 3136328.

Almost surely, 2^53317440 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 53317440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110365794).

53317440 is an abundant number, since it is smaller than the sum of its proper divisors (167414148).

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

53317440 is a wasteful number, since it uses less digits than its factorization.

53317440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68 (or 38 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 27.

The square root of 53317440 is about 7301.8792101760. The cubic root of 53317440 is about 376.3770173395.

Adding to 53317440 its reverse (4471335), we get a palindrome (57788775).

The spelling of 53317440 in words is "fifty-three million, three hundred seventeen thousand, four hundred forty".