627329681 has 4 divisors (see below), whose sum is σ = 684359664. Its totient is φ = 570299700.

The previous prime is 627329663. The next prime is 627329719. The reversal of 627329681 is 186923726.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-627329681 is a prime.

It is a super-2 number, since 2×627329681² = 787085057327123522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (627329611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28514975 + ... + 28514996.

It is an arithmetic number, because the mean of its divisors is an integer number (171089916).

Almost surely, 2^627329681 is an apocalyptic number.

It is an amenable number.

627329681 is a deficient number, since it is larger than the sum of its proper divisors (57029983).

627329681 is a wasteful number, since it uses less digits than its factorization.

627329681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57029982.

The product of its digits is 217728, while the sum is 44.

The square root of 627329681 is about 25046.5502814260. The cubic root of 627329681 is about 856.0489757294.

The spelling of 627329681 in words is "six hundred twenty-seven million, three hundred twenty-nine thousand, six hundred eighty-one".