1628630672138 has 4 divisors (see below), whose sum is σ = 2442946008210. Its totient is φ = 814315336068.

The previous prime is 1628630672107. The next prime is 1628630672177. The reversal of 1628630672138 is 8312760368261.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1217189247169 + 411441424969 = 1103263^2 + 641437^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1628630672138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 407157668033 + ... + 407157668036.

Almost surely, 2^{1628630672138} is an apocalyptic number.

1628630672138 is a deficient number, since it is larger than the sum of its proper divisors (814315336072).

1628630672138 is an equidigital number, since it uses as much as digits as its factorization.

1628630672138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814315336071.

The product of its (nonzero) digits is 3483648, while the sum is 53.

The spelling of 1628630672138 in words is "one trillion, six hundred twenty-eight billion, six hundred thirty million, six hundred seventy-two thousand, one hundred thirty-eight".