53551440 has 60 divisors (see below), whose sum is σ = 179846004. Its totient is φ = 14280192.

The previous prime is 53551439. The next prime is 53551441. The reversal of 53551440 is 4415535.

It is an interprime number because it is at equal distance from previous prime (53551439) and next prime (53551441).

It can be written as a sum of positive squares in 2 ways, for example, as 7420176 + 46131264 = 2724^2 + 6792^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53551441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 36469 + ... + 37908.

Almost surely, 2^53551440 is an apocalyptic number.

It is an amenable number.

53551440 is an abundant number, since it is smaller than the sum of its proper divisors (126294564).

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

53551440 is a wasteful number, since it uses less digits than its factorization.

53551440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74396 (or 74387 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

The square root of 53551440 is about 7317.8849403362. The cubic root of 53551440 is about 376.9268292539.

Adding to 53551440 its reverse (4415535), we get a palindrome (57966975).

The spelling of 53551440 in words is "fifty-three million, five hundred fifty-one thousand, four hundred forty".