640014810 has 96 divisors (see below), whose sum is σ = 1718677440. Its totient is φ = 151584768.

The previous prime is 640014799. The next prime is 640014811. The reversal of 640014810 is 18410046.

It is a super-2 number, since 2×640014810² = 819237914038672200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640014811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2490202 + ... + 2490458.

It is an arithmetic number, because the mean of its divisors is an integer number (17902890).

Almost surely, 2^640014810 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640014810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (859338720).

640014810 is an abundant number, since it is smaller than the sum of its proper divisors (1078662630).

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

640014810 is a wasteful number, since it uses less digits than its factorization.

640014810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560 (or 303 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 640014810 is about 25298.5139879796. The cubic root of 640014810 is about 861.7805232902.

Adding to 640014810 its reverse (18410046), we get a palindrome (658424856).

The spelling of 640014810 in words is "six hundred forty million, fourteen thousand, eight hundred ten".