637920252 has 48 divisors (see below), whose sum is σ = 1660797600. Its totient is φ = 211749120.

The previous prime is 637920251. The next prime is 637920259. The reversal of 637920252 is 252029736.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (637920251) 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, 13774 + ... + 38282.

It is an arithmetic number, because the mean of its divisors is an integer number (34599950).

Almost surely, 2^637920252 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 637920252, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (830398800).

637920252 is an abundant number, since it is smaller than the sum of its proper divisors (1022877348).

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

637920252 is a wasteful number, since it uses less digits than its factorization.

637920252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24763 (or 24755 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 36.

The square root of 637920252 is about 25257.0832045191. The cubic root of 637920252 is about 860.8393877831.

Adding to 637920252 its reverse (252029736), we get a palindrome (889949988).

The spelling of 637920252 in words is "six hundred thirty-seven million, nine hundred twenty thousand, two hundred fifty-two".