627808764421 has 4 divisors (see below), whose sum is σ = 627939209452. Its totient is φ = 627678319392.

The previous prime is 627808764413. The next prime is 627808764433. The reversal of 627808764421 is 124467808726.

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

It can be written as a sum of positive squares in 2 ways, for example, as 579402604225 + 48406160196 = 761185^2 + 220014^2 .

It is a cyclic number.

It is not a de Polignac number, because 627808764421 - 2³ = 627808764413 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 (627808774421) by changing a digit.

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, 65215296 + ... + 65224921.

It is an arithmetic number, because the mean of its divisors is an integer number (156984802363).

Almost surely, 2^627808764421 is an apocalyptic number.

It is an amenable number.

627808764421 is a deficient number, since it is larger than the sum of its proper divisors (130445031).

627808764421 is a wasteful number, since it uses less digits than its factorization.

627808764421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 130445030.

The product of its (nonzero) digits is 7225344, while the sum is 55.

The spelling of 627808764421 in words is "six hundred twenty-seven billion, eight hundred eight million, seven hundred sixty-four thousand, four hundred twenty-one".