627705981 has 12 divisors (see below), whose sum is σ = 1036213152. Its totient is φ = 358689096.

The previous prime is 627705979. The next prime is 627705989. The reversal of 627705981 is 189507726.

It is not a de Polignac number, because 627705981 - 2¹ = 627705979 is a prime.

It is a super-2 number, since 2×627705981² = 788029597166344722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (627705989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4981731 + ... + 4981856.

It is an arithmetic number, because the mean of its divisors is an integer number (86351096).

Almost surely, 2^627705981 is an apocalyptic number.

It is an amenable number.

627705981 is a deficient number, since it is larger than the sum of its proper divisors (408507171).

627705981 is a wasteful number, since it uses less digits than its factorization.

627705981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9963600 (or 9963597 counting only the distinct ones).

The product of its (nonzero) digits is 211680, while the sum is 45.

The square root of 627705981 is about 25054.0611678027. The cubic root of 627705981 is about 856.2201068222.

The spelling of 627705981 in words is "six hundred twenty-seven million, seven hundred five thousand, nine hundred eighty-one".