1628138276 has 12 divisors (see below), whose sum is σ = 2897534640. Its totient is φ = 800271240.

The previous prime is 1628138261. The next prime is 1628138299. The reversal of 1628138276 is 6728318261.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3449210 + ... + 3449681.

It is an arithmetic number, because the mean of its divisors is an integer number (241461220).

Almost surely, 2^1628138276 is an apocalyptic number.

It is an amenable number.

1628138276 is a deficient number, since it is larger than the sum of its proper divisors (1269396364).

1628138276 is a wasteful number, since it uses less digits than its factorization.

1628138276 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6898954 (or 6898952 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 1628138276 is about 40350.1954889936. The cubic root of 1628138276 is about 1176.4236917575.

The spelling of 1628138276 in words is "one billion, six hundred twenty-eight million, one hundred thirty-eight thousand, two hundred seventy-six".