641276140 has 24 divisors (see below), whose sum is σ = 1347343200. Its totient is φ = 256384128.

The previous prime is 641276113. The next prime is 641276143. The reversal of 641276140 is 41672146.

It is a super-2 number, since 2×641276140² = 822470175466599200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (641276143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41161 + ... + 54559.

It is an arithmetic number, because the mean of its divisors is an integer number (56139300).

Almost surely, 2^641276140 is an apocalyptic number.

It is an amenable number.

641276140 is an abundant number, since it is smaller than the sum of its proper divisors (706067060).

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

641276140 is a wasteful number, since it uses less digits than its factorization.

641276140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15801 (or 15799 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 641276140 is about 25323.4306522635. The cubic root of 641276140 is about 862.3462791226.

The spelling of 641276140 in words is "six hundred forty-one million, two hundred seventy-six thousand, one hundred forty".