1628123538 has 16 divisors (see below), whose sum is σ = 3266857440. Its totient is φ = 540939456.

The previous prime is 1628123533. The next prime is 1628123579. The reversal of 1628123538 is 8353218261.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1628123496 and 1628123505.

It is not an unprimeable number, because it can be changed into a prime (1628123533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 440103 + ... + 443786.

It is an arithmetic number, because the mean of its divisors is an integer number (204178590).

Almost surely, 2^1628123538 is an apocalyptic number.

1628123538 is an abundant number, since it is smaller than the sum of its proper divisors (1638733902).

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

1628123538 is a wasteful number, since it uses less digits than its factorization.

1628123538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884201.

The product of its digits is 69120, while the sum is 39.

The square root of 1628123538 is about 40350.0128624515. The cubic root of 1628123538 is about 1176.4201420621.

The spelling of 1628123538 in words is "one billion, six hundred twenty-eight million, one hundred twenty-three thousand, five hundred thirty-eight".