640002810 has 32 divisors (see below), whose sum is σ = 1538337600. Its totient is φ = 170408448.

The previous prime is 640002809. The next prime is 640002823. The reversal of 640002810 is 18200046.

It is a super-2 number, since 2×640002810² = 819207193615792200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4341 + ... + 36039.

It is an arithmetic number, because the mean of its divisors is an integer number (48073050).

Almost surely, 2^640002810 is an apocalyptic number.

640002810 is an abundant number, since it is smaller than the sum of its proper divisors (898334790).

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

640002810 is a wasteful number, since it uses less digits than its factorization.

640002810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32382.

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 640002810 is about 25298.2768187875. The cubic root of 640002810 is about 861.7751372529.

Adding to 640002810 its reverse (18200046), we get a palindrome (658202856).

The spelling of 640002810 in words is "six hundred forty million, two thousand, eight hundred ten".