53549640 has 128 divisors (see below), whose sum is σ = 180144000. Its totient is φ = 14148864.

The previous prime is 53549627. The next prime is 53549641. The reversal of 53549640 is 4694535.

It is a happy number.

53549640 is a `hidden beast` number, since 5 + 3 + 5 + 4 + 9 + 640 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 53549595 and 53549604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53549641) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 193182 + ... + 193458.

It is an arithmetic number, because the mean of its divisors is an integer number (1407375).

Almost surely, 2^53549640 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 53549640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90072000).

53549640 is an abundant number, since it is smaller than the sum of its proper divisors (126594360).

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

53549640 is a wasteful number, since it uses less digits than its factorization.

53549640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 476 (or 466 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 36.

The square root of 53549640 is about 7317.7619529471. The cubic root of 53549640 is about 376.9226060503.

The spelling of 53549640 in words is "fifty-three million, five hundred forty-nine thousand, six hundred forty".