53531640 has 96 divisors (see below), whose sum is σ = 184232880. Its totient is φ = 13433856.

The previous prime is 53531633. The next prime is 53531641. The reversal of 53531640 is 4613535.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53531641) 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, 1747 + ... + 10493.

Almost surely, 2^53531640 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 53531640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92116440).

53531640 is an abundant number, since it is smaller than the sum of its proper divisors (130701240).

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

53531640 is a wasteful number, since it uses less digits than its factorization.

53531640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8781 (or 8774 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

The square root of 53531640 is about 7316.5319653508. The cubic root of 53531640 is about 376.8803688088.

The spelling of 53531640 in words is "fifty-three million, five hundred thirty-one thousand, six hundred forty".