641892438 has 80 divisors (see below), whose sum is σ = 1623306960. Its totient is φ = 187790400.

The previous prime is 641892437. The next prime is 641892439. The reversal of 641892438 is 834298146.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (641892437) and next prime (641892439).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 641892393 and 641892402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641892437) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 45468 + ... + 57888.

It is an arithmetic number, because the mean of its divisors is an integer number (20291337).

Almost surely, 2^641892438 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641892438, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (811653480).

641892438 is an abundant number, since it is smaller than the sum of its proper divisors (981414522).

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

641892438 is a wasteful number, since it uses less digits than its factorization.

641892438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12475 (or 12466 counting only the distinct ones).

The product of its digits is 331776, while the sum is 45.

The square root of 641892438 is about 25335.5962629657. The cubic root of 641892438 is about 862.6224431083.

The spelling of 641892438 in words is "six hundred forty-one million, eight hundred ninety-two thousand, four hundred thirty-eight".