671428 has 12 divisors (see below), whose sum is σ = 1181740. Its totient is φ = 333792.

The previous prime is 671417. The next prime is 671431. The reversal of 671428 is 824176.

671428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 643204 + 28224 = 802^2 + 168^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 671396 and 671405.

It is a congruent number.

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, 550 + ... + 1282.

2⁶⁷¹⁴²⁸ is an apocalyptic number.

It is an amenable number.

671428 is a deficient number, since it is larger than the sum of its proper divisors (510312).

671428 is a wasteful number, since it uses less digits than its factorization.

671428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966 (or 964 counting only the distinct ones).

The product of its digits is 2688, while the sum is 28.

The square root of 671428 is about 819.4071027273. The cubic root of 671428 is about 87.5655237099.

The spelling of 671428 in words is "six hundred seventy-one thousand, four hundred twenty-eight".