641376 has 72 divisors (see below), whose sum is σ = 1945944. Its totient is φ = 199680.

The previous prime is 641371. The next prime is 641387. The reversal of 641376 is 673146.

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×641376² = 822726346752, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641371) by changing a digit.

641376 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 11 ways as a sum of consecutive naturals, for example, 4831 + ... + 4961.

It is an arithmetic number, because the mean of its divisors is an integer number (27027).

2⁶⁴¹³⁷⁶ 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 641376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (972972).

641376 is an abundant number, since it is smaller than the sum of its proper divisors (1304568).

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

641376 is a wasteful number, since it uses less digits than its factorization.

641376 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164 (or 153 counting only the distinct ones).

The product of its digits is 3024, while the sum is 27.

The square root of 641376 is about 800.8595382463. The cubic root of 641376 is about 86.2391038535.

The spelling of 641376 in words is "six hundred forty-one thousand, three hundred seventy-six".