53561660 has 48 divisors (see below), whose sum is σ = 117096672. Its totient is φ = 20563200.

The previous prime is 53561653. The next prime is 53561699. The reversal of 53561660 is 6616535.

It is a super-3 number, since 3×53561660³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51950 + ... + 52970.

It is an arithmetic number, because the mean of its divisors is an integer number (2439514).

Almost surely, 2^53561660 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 53561660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58548336).

53561660 is an abundant number, since it is smaller than the sum of its proper divisors (63535012).

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

53561660 is a wasteful number, since it uses less digits than its factorization.

53561660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134 (or 1132 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 32.

The square root of 53561660 is about 7318.5831962204. The cubic root of 53561660 is about 376.9508058713.

The spelling of 53561660 in words is "fifty-three million, five hundred sixty-one thousand, six hundred sixty".