1628125 has 12 divisors (see below), whose sum is σ = 2038932. Its totient is φ = 1300000.

The previous prime is 1628117. The next prime is 1628131. The reversal of 1628125 is 5218261.

It can be written as a sum of positive squares in 6 ways, for example, as 1466521 + 161604 = 1211^2 + 402^2 .

It is not a de Polignac number, because 1628125 - 2³ = 1628117 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1628125.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2865 + ... + 3385.

It is an arithmetic number, because the mean of its divisors is an integer number (169911).

2^1628125 is an apocalyptic number.

1628125 is the 1042-nd pentagonal number.

It is an amenable number.

1628125 is a deficient number, since it is larger than the sum of its proper divisors (410807).

1628125 is an frugal number, since it uses more digits than its factorization.

1628125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546 (or 526 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

The square root of 1628125 is about 1275.9800155175. The cubic root of 1628125 is about 117.6420494191.

The spelling of 1628125 in words is "one million, six hundred twenty-eight thousand, one hundred twenty-five".