162640404 has 18 divisors (see below), whose sum is σ = 411118890. Its totient is φ = 54213456.

The previous prime is 162640363. The next prime is 162640421. The reversal of 162640404 is 404046261.

162640404 is a `hidden beast` number, since 16 + 2 + 640 + 4 + 0 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 161340804 + 1299600 = 12702^2 + 1140^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

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, 2258859 + ... + 2258930.

Almost surely, 2^162640404 is an apocalyptic number.

It is an amenable number.

162640404 is an abundant number, since it is smaller than the sum of its proper divisors (248478486).

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

162640404 is a wasteful number, since it uses less digits than its factorization.

162640404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4517799 (or 4517794 counting only the distinct ones).

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

The square root of 162640404 is about 12753.0546928961. The cubic root of 162640404 is about 545.8535613401.

Adding to 162640404 its reverse (404046261), we get a palindrome (566686665).

The spelling of 162640404 in words is "one hundred sixty-two million, six hundred forty thousand, four hundred four".