53665740 has 120 divisors (see below), whose sum is σ = 170226672. Its totient is φ = 14152320.

The previous prime is 53665721. The next prime is 53665757. The reversal of 53665740 is 4756635.

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 = 53665695 and 53665704.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 254235 + ... + 254445.

Almost surely, 2^53665740 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 53665740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (85113336).

53665740 is an abundant number, since it is smaller than the sum of its proper divisors (116560932).

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

53665740 is a wasteful number, since it uses less digits than its factorization.

53665740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389 (or 378 counting only the distinct ones).

The product of its (nonzero) digits is 75600, while the sum is 36.

The square root of 53665740 is about 7325.6904111490. The cubic root of 53665740 is about 377.1948091065.

The spelling of 53665740 in words is "fifty-three million, six hundred sixty-five thousand, seven hundred forty".