640305146 has 16 divisors (see below), whose sum is σ = 1038031848. Its totient is φ = 294470400.

The previous prime is 640305089. The next prime is 640305151. The reversal of 640305146 is 641503046.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 630763225 + 9541921 = 25115^2 + 3089^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36515 + ... + 51126.

Almost surely, 2^640305146 is an apocalyptic number.

640305146 is a deficient number, since it is larger than the sum of its proper divisors (397726702).

640305146 is a wasteful number, since it uses less digits than its factorization.

640305146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87937.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 640305146 is about 25304.2515400081. The cubic root of 640305146 is about 861.9108161528.

The spelling of 640305146 in words is "six hundred forty million, three hundred five thousand, one hundred forty-six".