640126472 has 16 divisors (see below), whose sum is σ = 1209000060. Its totient is φ = 317726464.

The previous prime is 640126453. The next prime is 640126519. The reversal of 640126472 is 274621046.

It can be written as a sum of positive squares in 2 ways, for example, as 537590596 + 102535876 = 23186^2 + 10126^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 290933 + ... + 293124.

Almost surely, 2^640126472 is an apocalyptic number.

It is an amenable number.

640126472 is a deficient number, since it is larger than the sum of its proper divisors (568873588).

640126472 is a wasteful number, since it uses less digits than its factorization.

640126472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584200 (or 584196 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 640126472 is about 25300.7207802466. The cubic root of 640126472 is about 861.8306380373.

The spelling of 640126472 in words is "six hundred forty million, one hundred twenty-six thousand, four hundred seventy-two".