53749644 has 72 divisors (see below), whose sum is σ = 141014160. Its totient is φ = 15821568.

The previous prime is 53749609. The next prime is 53749669. The reversal of 53749644 is 44694735.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 53749596 and 53749605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 493062 + ... + 493170.

It is an arithmetic number, because the mean of its divisors is an integer number (1958530).

Almost surely, 2^53749644 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 53749644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70507080).

53749644 is an abundant number, since it is smaller than the sum of its proper divisors (87264516).

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

53749644 is a wasteful number, since it uses less digits than its factorization.

53749644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 156 counting only the distinct ones).

The product of its digits is 362880, while the sum is 42.

The square root of 53749644 is about 7331.4148702689. The cubic root of 53749644 is about 377.3912825244.

The spelling of 53749644 in words is "fifty-three million, seven hundred forty-nine thousand, six hundred forty-four".