253621044 has 144 divisors (see below), whose sum is σ = 724039680. Its totient is φ = 77332320.

The previous prime is 253621033. The next prime is 253621061. The reversal of 253621044 is 440126352.

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

It is a junction number, because it is equal to n+sod(n) for n = 253620999 and 253621017.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 572287 + ... + 572729.

Almost surely, 2^253621044 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 253621044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (362019840).

253621044 is an abundant number, since it is smaller than the sum of its proper divisors (470418636).

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

253621044 is a wasteful number, since it uses less digits than its factorization.

253621044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 512 (or 498 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 253621044 is about 15925.4841056716. The cubic root of 253621044 is about 632.9874438784.

Adding to 253621044 its reverse (440126352), we get a palindrome (693747396).

The spelling of 253621044 in words is "two hundred fifty-three million, six hundred twenty-one thousand, forty-four".