641314278 has 72 divisors (see below), whose sum is σ = 1534273104. Its totient is φ = 193453920.

The previous prime is 641314243. The next prime is 641314279. The reversal of 641314278 is 872413146.

641314278 is a `hidden beast` number, since 641 + 3 + 1 + 4 + 2 + 7 + 8 = 666.

It is a super-2 number, since 2×641314278² = 822568006333322568, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (641314279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 602775 + ... + 603837.

Almost surely, 2^641314278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 641314278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (767136552).

641314278 is an abundant number, since it is smaller than the sum of its proper divisors (892958826).

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

641314278 is a wasteful number, since it uses less digits than its factorization.

641314278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370 (or 1356 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 641314278 is about 25324.1836591034. The cubic root of 641314278 is about 862.3633739478.

The spelling of 641314278 in words is "six hundred forty-one million, three hundred fourteen thousand, two hundred seventy-eight".