53481645 has 24 divisors (see below), whose sum is σ = 105945216. Its totient is φ = 24448608.

The previous prime is 53481641. The next prime is 53481661. The reversal of 53481645 is 54618435.

It is a happy number.

53481645 is a `hidden beast` number, since 5 + 3 + 4 + 8 + 1 + 645 = 666.

It is not a de Polignac number, because 53481645 - 2² = 53481641 is a prime.

It is a super-3 number, since 3×53481645³ (a number of 24 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53481641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 84577 + ... + 85206.

It is an arithmetic number, because the mean of its divisors is an integer number (4414384).

Almost surely, 2^53481645 is an apocalyptic number.

It is an amenable number.

53481645 is a deficient number, since it is larger than the sum of its proper divisors (52463571).

53481645 is a wasteful number, since it uses less digits than its factorization.

53481645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169801 (or 169798 counting only the distinct ones).

The product of its digits is 57600, while the sum is 36.

The square root of 53481645 is about 7313.1145895576. The cubic root of 53481645 is about 376.7630051783.

The spelling of 53481645 in words is "fifty-three million, four hundred eighty-one thousand, six hundred forty-five".