640551410 has 16 divisors (see below), whose sum is σ = 1158848856. Its totient is φ = 254919168.

The previous prime is 640551409. The next prime is 640551413. The reversal of 640551410 is 14155046.

It can be written as a sum of positive squares in 4 ways, for example, as 640545481 + 5929 = 25309^2 + 77^2 .

It is a super-2 number, since 2×640551410² = 820612217705976200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 640551410.

It is not an unprimeable number, because it can be changed into a prime (640551413) 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, 160607 + ... + 164546.

Almost surely, 2^640551410 is an apocalyptic number.

640551410 is a deficient number, since it is larger than the sum of its proper divisors (518297446).

640551410 is a wasteful number, since it uses less digits than its factorization.

640551410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325357.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 640551410 is about 25309.1171319744. The cubic root of 640551410 is about 862.0213001414.

The spelling of 640551410 in words is "six hundred forty million, five hundred fifty-one thousand, four hundred ten".