53090640 has 120 divisors (see below), whose sum is σ = 184967328. Its totient is φ = 14152320.

The previous prime is 53090627. The next prime is 53090641. The reversal of 53090640 is 4609035.

It is a happy number.

53090640 is a `hidden beast` number, since 530 + 90 + 6 + 40 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53090641) 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, 18075 + ... + 20805.

Almost surely, 2^53090640 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 53090640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92483664).

53090640 is an abundant number, since it is smaller than the sum of its proper divisors (131876688).

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

53090640 is a wasteful number, since it uses less digits than its factorization.

53090640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2759 (or 2741 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

The square root of 53090640 is about 7286.3324107537. The cubic root of 53090640 is about 375.8425853817.

Adding to 53090640 its reverse (4609035), we get a palindrome (57699675).

The spelling of 53090640 in words is "fifty-three million, ninety thousand, six hundred forty".