1628605404 has 18 divisors (see below), whose sum is σ = 4116752640. Its totient is φ = 542868456.

The previous prime is 1628605397. The next prime is 1628605441. The reversal of 1628605404 is 4045068261.

1628605404 is a `hidden beast` number, since 1 + 6 + 2 + 8 + 605 + 40 + 4 = 666.

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

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 45239039 = 1628605404 / (1 + 6 + 2 + 8 + 6 + 0 + 5 + 4 + 0 + 4).

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, 22619484 + ... + 22619555.

It is an arithmetic number, because the mean of its divisors is an integer number (228708480).

Almost surely, 2^1628605404 is an apocalyptic number.

It is an amenable number.

1628605404 is an abundant number, since it is smaller than the sum of its proper divisors (2488147236).

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

1628605404 is a wasteful number, since it uses less digits than its factorization.

1628605404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45239049 (or 45239044 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 36.

The square root of 1628605404 is about 40355.9834968744. The cubic root of 1628605404 is about 1176.5361899621.

The spelling of 1628605404 in words is "one billion, six hundred twenty-eight million, six hundred five thousand, four hundred four".