641004 has 48 divisors (see below), whose sum is σ = 1843968. Its totient is φ = 168768.

The previous prime is 640993. The next prime is 641051. The reversal of 641004 is 400146.

It is a super-2 number, since 2×641004² = 821772256032, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

641004 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 799 + ... + 1385.

It is an arithmetic number, because the mean of its divisors is an integer number (38416).

2⁶⁴¹⁰⁰⁴ 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 641004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (921984).

641004 is an abundant number, since it is smaller than the sum of its proper divisors (1202964).

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

641004 is a wasteful number, since it uses less digits than its factorization.

641004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614 (or 612 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 641004 is about 800.6272540952. The cubic root of 641004 is about 86.2224276496. Note that the first 3 decimals are identical.

The spelling of 641004 in words is "six hundred forty-one thousand, four".