640346112 has 216 divisors, whose sum is σ = 2154420450. Its totient is φ = 182697984.

The previous prime is 640346107. The next prime is 640346117. The reversal of 640346112 is 211643046.

640346112 is a `hidden beast` number, since 6 + 40 + 3 + 4 + 611 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (640346107) and next prime (640346117).

It can be written as a sum of positive squares in only one way, i.e., 618218496 + 22127616 = 24864^2 + 4704^2 .

It is not an unprimeable number, because it can be changed into a prime (640346117) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 902814 + ... + 903522.

Almost surely, 2^640346112 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 640346112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1077210225).

640346112 is an abundant number, since it is smaller than the sum of its proper divisors (1514074338).

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

640346112 is a wasteful number, since it uses less digits than its factorization.

640346112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 751 (or 721 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 640346112 is about 25305.0609957771. The cubic root of 640346112 is about 861.9291971209.

Adding to 640346112 its reverse (211643046), we get a palindrome (851989158).

The spelling of 640346112 in words is "six hundred forty million, three hundred forty-six thousand, one hundred twelve".