627985789 has 8 divisors (see below), whose sum is σ = 639130968. Its totient is φ = 616868160.

The previous prime is 627985783. The next prime is 627985819. The reversal of 627985789 is 987589726.

It can be written as a sum of positive squares in 4 ways, for example, as 7128900 + 620856889 = 2670^2 + 24917^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 627985789 - 2⁹ = 627985277 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (627985783) 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, 42159 + ... + 55075.

It is an arithmetic number, because the mean of its divisors is an integer number (79891371).

Almost surely, 2^627985789 is an apocalyptic number.

It is an amenable number.

627985789 is a deficient number, since it is larger than the sum of its proper divisors (11145179).

627985789 is a wasteful number, since it uses less digits than its factorization.

627985789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13775.

The product of its digits is 15240960, while the sum is 61.

The square root of 627985789 is about 25059.6446303614. The cubic root of 627985789 is about 856.3473116248.

The spelling of 627985789 in words is "six hundred twenty-seven million, nine hundred eighty-five thousand, seven hundred eighty-nine".