1628904 has 32 divisors (see below), whose sum is σ = 4137120. Its totient is φ = 534336.

The previous prime is 1628897. The next prime is 1628909. The reversal of 1628904 is 4098261.

It is not an unprimeable number, because it can be changed into a prime (1628909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1102 + ... + 2114.

It is an arithmetic number, because the mean of its divisors is an integer number (129285).

2^1628904 is an apocalyptic number.

It is an amenable number.

1628904 is an abundant number, since it is smaller than the sum of its proper divisors (2508216).

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

1628904 is a wasteful number, since it uses less digits than its factorization.

1628904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1089 (or 1085 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 30.

The square root of 1628904 is about 1276.2852345773. The cubic root of 1628904 is about 117.6608089419.

It can be divided in two parts, 16 and 28904, that added together give a triangular number (28920 = T₂₄₀).

The spelling of 1628904 in words is "one million, six hundred twenty-eight thousand, nine hundred four".