743428 has 18 divisors (see below), whose sum is σ = 1513806. Its totient is φ = 318528.

The previous prime is 743423. The next prime is 743447. The reversal of 743428 is 824347.

It can be written as a sum of positive squares in only one way, i.e., 529984 + 213444 = 728^2 + 462^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 743396 and 743405.

It is not an unprimeable number, because it can be changed into a prime (743423) by changing a digit.

743428 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1701 + ... + 2092.

2⁷⁴³⁴²⁸ is an apocalyptic number.

It is an amenable number.

743428 is an abundant number, since it is smaller than the sum of its proper divisors (770378).

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

743428 is a wasteful number, since it uses less digits than its factorization.

743428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3811 (or 3802 counting only the distinct ones).

The product of its digits is 5376, while the sum is 28.

The square root of 743428 is about 862.2227090491. Note that the first 3 decimals coincide. The cubic root of 743428 is about 90.5898703319.

The spelling of 743428 in words is "seven hundred forty-three thousand, four hundred twenty-eight".