1628739423 has 12 divisors (see below), whose sum is σ = 2407336360. Its totient is φ = 1060574256.

The previous prime is 1628739421. The next prime is 1628739439. The reversal of 1628739423 is 3249378261.

1628739423 is a `hidden beast` number, since 162 + 87 + 394 + 23 = 666.

It is not a de Polignac number, because 1628739423 - 2¹ = 1628739421 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1628739421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2103928 + ... + 2104701.

Almost surely, 2^1628739423 is an apocalyptic number.

1628739423 is a deficient number, since it is larger than the sum of its proper divisors (778596937).

1628739423 is a wasteful number, since it uses less digits than its factorization.

1628739423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208678 (or 4208675 counting only the distinct ones).

The product of its digits is 435456, while the sum is 45.

The square root of 1628739423 is about 40357.6439228060. The cubic root of 1628739423 is about 1176.5684617201.

The spelling of 1628739423 in words is "one billion, six hundred twenty-eight million, seven hundred thirty-nine thousand, four hundred twenty-three".