53091840 has 160 divisors (see below), whose sum is σ = 175988736. Its totient is φ = 13639680.

The previous prime is 53091839. The next prime is 53091847. The reversal of 53091840 is 4819035.

It is a tau number, because it is divible by the number of its divisors (160).

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 = 53091798 and 53091807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53091847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 237969 + ... + 238191.

Almost surely, 2^53091840 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 53091840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87994368).

53091840 is an abundant number, since it is smaller than the sum of its proper divisors (122896896).

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

53091840 is a wasteful number, since it uses less digits than its factorization.

53091840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280 (or 264 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 53091840 is about 7286.4147562433. The cubic root of 53091840 is about 375.8454170655.

The spelling of 53091840 in words is "fifty-three million, ninety-one thousand, eight hundred forty".