1257628 has 6 divisors (see below), whose sum is σ = 2200856. Its totient is φ = 628812.

The previous prime is 1257611. The next prime is 1257647. The reversal of 1257628 is 8267521.

It is a self number, because there is not a number n which added to its sum of digits gives 1257628.

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, 157200 + ... + 157207.

2^1257628 is an apocalyptic number.

It is an amenable number.

1257628 is a deficient number, since it is larger than the sum of its proper divisors (943228).

1257628 is a wasteful number, since it uses less digits than its factorization.

1257628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 314411 (or 314409 counting only the distinct ones).

The product of its digits is 6720, while the sum is 31.

The square root of 1257628 is about 1121.4401455272. The cubic root of 1257628 is about 107.9404106574.

It can be divided in two parts, 1257 and 628, that multiplied together give a triangular number (789396 = T₁₂₅₆).

The spelling of 1257628 in words is "one million, two hundred fifty-seven thousand, six hundred twenty-eight".