640261096 has 8 divisors (see below), whose sum is σ = 1200489570. Its totient is φ = 320130544.

The previous prime is 640261093. The next prime is 640261103. The reversal of 640261096 is 690162046.

640261096 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 630712996 + 9548100 = 25114^2 + 3090^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×640261096² = 819868542102242432, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (640261093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40016311 + ... + 40016326.

Almost surely, 2^640261096 is an apocalyptic number.

It is an amenable number.

640261096 is a deficient number, since it is larger than the sum of its proper divisors (560228474).

640261096 is a wasteful number, since it uses less digits than its factorization.

640261096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80032643 (or 80032639 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 640261096 is about 25303.3811179455. The cubic root of 640261096 is about 861.8910505549.

The spelling of 640261096 in words is "six hundred forty million, two hundred sixty-one thousand, ninety-six".