1628428 has 12 divisors (see below), whose sum is σ = 2859472. Its totient is φ = 811440.

The previous prime is 1628401. The next prime is 1628441. The reversal of 1628428 is 8248261.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1628428.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1201 + ... + 2167.

2^1628428 is an apocalyptic number.

It is an amenable number.

1628428 is a deficient number, since it is larger than the sum of its proper divisors (1231044).

1628428 is a wasteful number, since it uses less digits than its factorization.

1628428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1392 (or 1390 counting only the distinct ones).

The product of its digits is 6144, while the sum is 31.

The square root of 1628428 is about 1276.0987422610. The cubic root of 1628428 is about 117.6493468379.

The spelling of 1628428 in words is "one million, six hundred twenty-eight thousand, four hundred twenty-eight".