1625428 has 18 divisors (see below), whose sum is σ = 3309306. Its totient is φ = 696528.

The previous prime is 1625419. The next prime is 1625453. The reversal of 1625428 is 8245261.

It can be written as a sum of positive squares in only one way, i.e., 1192464 + 432964 = 1092^2 + 658^2 .

It is a Harshad number since it is a multiple of its sum of digits (28).

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1625396 and 1625405.

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, 3951 + ... + 4342.

2^1625428 is an apocalyptic number.

It is an amenable number.

1625428 is an abundant number, since it is smaller than the sum of its proper divisors (1683878).

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

1625428 is a wasteful number, since it uses less digits than its factorization.

1625428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8311 (or 8302 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 1625428 is about 1274.9227427574. The cubic root of 1625428 is about 117.5770552363.

The spelling of 1625428 in words is "one million, six hundred twenty-five thousand, four hundred twenty-eight".