641254328 has 64 divisors (see below), whose sum is σ = 1416683520. Its totient is φ = 268272000.

The previous prime is 641254307. The next prime is 641254349. The reversal of 641254328 is 823452146.

It is a Cunningham number, because it is equal to 25323²-1.

It is an interprime number because it is at equal distance from previous prime (641254307) and next prime (641254349).

It is a super-2 number, since 2×641254328² = 822414226357463168, which contains 22 as substring.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 556553 + ... + 557703.

It is an arithmetic number, because the mean of its divisors is an integer number (22135680).

Almost surely, 2^641254328 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 641254328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (708341760).

641254328 is an abundant number, since it is smaller than the sum of its proper divisors (775429192).

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

641254328 is a wasteful number, since it uses less digits than its factorization.

641254328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1668 (or 1664 counting only the distinct ones).

The product of its digits is 46080, while the sum is 35.

The square root of 641254328 is about 25322.9999802551. Note that the first 4 decimals coincide. The cubic root of 641254328 is about 862.3365018940.

The spelling of 641254328 in words is "six hundred forty-one million, two hundred fifty-four thousand, three hundred twenty-eight".