428738 has 6 divisors (see below), whose sum is σ = 644499. Its totient is φ = 213906.

The previous prime is 428731. The next prime is 428741. The reversal of 428738 is 837824.

428738 is nontrivially palindromic in base 15.

It can be written as a sum of positive squares in only one way, i.e., 214369 + 214369 = 463^2 + 463^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=463.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (428731) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 695 + ... + 1157.

2⁴²⁸⁷³⁸ is an apocalyptic number.

428738 is a deficient number, since it is larger than the sum of its proper divisors (215761).

428738 is an frugal number, since it uses more digits than its factorization.

428738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 928 (or 465 counting only the distinct ones).

The product of its digits is 10752, while the sum is 32.

The square root of 428738 is about 654.7808793787. The cubic root of 428738 is about 75.4045106557.

Multiplying 428738 by its sum of digits (32), we get a square (13719616 = 3704²).

The spelling of 428738 in words is "four hundred twenty-eight thousand, seven hundred thirty-eight".