53543640 has 32 divisors (see below), whose sum is σ = 160631280. Its totient is φ = 14278272.

The previous prime is 53543639. The next prime is 53543641. The reversal of 53543640 is 4634535.

It is an interprime number because it is at equal distance from previous prime (53543639) and next prime (53543641).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 53543598 and 53543607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53543641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 222979 + ... + 223218.

Almost surely, 2^53543640 is an apocalyptic number.

It is an amenable number.

53543640 is an abundant number, since it is smaller than the sum of its proper divisors (107087640).

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

53543640 is a wasteful number, since it uses less digits than its factorization.

53543640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446211 (or 446207 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 30.

The square root of 53543640 is about 7317.3519800540. The cubic root of 53543640 is about 376.9085280216.

The spelling of 53543640 in words is "fifty-three million, five hundred forty-three thousand, six hundred forty".