53320440 has 64 divisors (see below), whose sum is σ = 166924800. Its totient is φ = 13599872.

The previous prime is 53320439. The next prime is 53320453. The reversal of 53320440 is 4402335.

53320440 = 401² + 402² + ... + 607².

It is a happy number.

It is a congruent number.

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, 6900 + ... + 12419.

It is an arithmetic number, because the mean of its divisors is an integer number (2608200).

Almost surely, 2^53320440 is an apocalyptic number.

It is an amenable number.

53320440 is an abundant number, since it is smaller than the sum of its proper divisors (113604360).

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

53320440 is a wasteful number, since it uses less digits than its factorization.

53320440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19356 (or 19352 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 21.

The square root of 53320440 is about 7302.0846338563. The cubic root of 53320440 is about 376.3840763798.

Adding to 53320440 its reverse (4402335), we get a palindrome (57722775).

The spelling of 53320440 in words is "fifty-three million, three hundred twenty thousand, four hundred forty".