1656628 has 6 divisors (see below), whose sum is σ = 2899106. Its totient is φ = 828312.

The previous prime is 1656617. The next prime is 1656631. The reversal of 1656628 is 8266561.

It can be written as a sum of positive squares in only one way, i.e., 1317904 + 338724 = 1148^2 + 582^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1656593 and 1656602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 207075 + ... + 207082.

2^1656628 is an apocalyptic number.

It is an amenable number.

1656628 is a deficient number, since it is larger than the sum of its proper divisors (1242478).

1656628 is a wasteful number, since it uses less digits than its factorization.

1656628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414161 (or 414159 counting only the distinct ones).

The product of its digits is 17280, while the sum is 34.

The square root of 1656628 is about 1287.1006176675. The cubic root of 1656628 is about 118.3245875085.

It can be divided in two parts, 16 and 56628, that added together give a square (56644 = 238²).

The spelling of 1656628 in words is "one million, six hundred fifty-six thousand, six hundred twenty-eight".