641037400 has 48 divisors (see below), whose sum is σ = 1495261440. Its totient is φ = 255580800.

The previous prime is 641037389. The next prime is 641037403. The reversal of 641037400 is 4730146.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641037403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 58345 + ... + 68455.

It is an arithmetic number, because the mean of its divisors is an integer number (31151280).

Almost surely, 2^641037400 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 641037400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (747630720).

641037400 is an abundant number, since it is smaller than the sum of its proper divisors (854224040).

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

641037400 is a wasteful number, since it uses less digits than its factorization.

641037400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10444 (or 10435 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 641037400 is about 25318.7163971636. The cubic root of 641037400 is about 862.2392518523.

Adding to 641037400 its reverse (4730146), we get a palindrome (645767546).

The spelling of 641037400 in words is "six hundred forty-one million, thirty-seven thousand, four hundred".