1628728606 has 4 divisors (see below), whose sum is σ = 2443092912. Its totient is φ = 814364302.

The previous prime is 1628728589. The next prime is 1628728643. The reversal of 1628728606 is 6068278261.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6068278261 = 15619 ⋅388519.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407182150 + ... + 407182153.

It is an arithmetic number, because the mean of its divisors is an integer number (610773228).

Almost surely, 2^1628728606 is an apocalyptic number.

1628728606 is a deficient number, since it is larger than the sum of its proper divisors (814364306).

1628728606 is an equidigital number, since it uses as much as digits as its factorization.

1628728606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814364305.

The product of its (nonzero) digits is 387072, while the sum is 46.

The square root of 1628728606 is about 40357.5099083182. The cubic root of 1628728606 is about 1176.5658570536.

The spelling of 1628728606 in words is "one billion, six hundred twenty-eight million, seven hundred twenty-eight thousand, six hundred six".