640404162 has 12 divisors (see below), whose sum is σ = 1387542390. Its totient is φ = 213468048.

The previous prime is 640404151. The next prime is 640404197. The reversal of 640404162 is 261404046.

640404162 is a `hidden beast` number, since 640 + 4 + 0 + 4 + 16 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 423166041 + 217238121 = 20571^2 + 14739^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 17788987 + ... + 17789022.

Almost surely, 2^640404162 is an apocalyptic number.

640404162 is an abundant number, since it is smaller than the sum of its proper divisors (747138228).

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

640404162 is a wasteful number, since it uses less digits than its factorization.

640404162 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35578017 (or 35578014 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 640404162 is about 25306.2079735388. The cubic root of 640404162 is about 861.9552421389.

The spelling of 640404162 in words is "six hundred forty million, four hundred four thousand, one hundred sixty-two".