290405665404 has 18 divisors (see below), whose sum is σ = 734080987640. Its totient is φ = 96801888456.

The previous prime is 290405665367. The next prime is 290405665423. The reversal of 290405665404 is 404566504092.

290405665404 is a `hidden beast` number, since 2 + 9 + 0 + 40 + 5 + 66 + 540 + 4 = 666.

290405665404 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

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

It is a self number, because there is not a number n which added to its sum of digits gives 290405665404.

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, 4033411984 + ... + 4033412055.

Almost surely, 2^290405665404 is an apocalyptic number.

It is an amenable number.

290405665404 is an abundant number, since it is smaller than the sum of its proper divisors (443675322236).

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

290405665404 is a wasteful number, since it uses less digits than its factorization.

290405665404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8066824049 (or 8066824044 counting only the distinct ones).

The product of its (nonzero) digits is 1036800, while the sum is 45.

Adding to 290405665404 its sum of digits (45), we get a square (290405665449 = 538893²).

The spelling of 290405665404 in words is "two hundred ninety billion, four hundred five million, six hundred sixty-five thousand, four hundred four".