640122412 has 6 divisors (see below), whose sum is σ = 1120214228. Its totient is φ = 320061204.

The previous prime is 640122409. The next prime is 640122419. The reversal of 640122412 is 214221046.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (640122419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80015298 + ... + 80015305.

Almost surely, 2^640122412 is an apocalyptic number.

It is an amenable number.

640122412 is a deficient number, since it is larger than the sum of its proper divisors (480091816).

640122412 is a wasteful number, since it uses less digits than its factorization.

640122412 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160030607 (or 160030605 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 640122412 is about 25300.6405452510. The cubic root of 640122412 is about 861.8288159808.

Adding to 640122412 its reverse (214221046), we get a palindrome (854343458).

The spelling of 640122412 in words is "six hundred forty million, one hundred twenty-two thousand, four hundred twelve".