681728627 has 4 divisors (see below), whose sum is σ = 681870000. Its totient is φ = 681587256.

The previous prime is 681728603. The next prime is 681728633. The reversal of 681728627 is 726827186.

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

It is a cyclic number.

It is not a de Polignac number, because 681728627 - 2⁶ = 681728563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (681728687) 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, 63188 + ... + 73185.

It is an arithmetic number, because the mean of its divisors is an integer number (170467500).

Almost surely, 2^681728627 is an apocalyptic number.

681728627 is a deficient number, since it is larger than the sum of its proper divisors (141373).

681728627 is a wasteful number, since it uses less digits than its factorization.

681728627 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141372.

The product of its digits is 451584, while the sum is 47.

The square root of 681728627 is about 26109.9334928299. The cubic root of 681728627 is about 880.1104488608.

The spelling of 681728627 in words is "six hundred eighty-one million, seven hundred twenty-eight thousand, six hundred twenty-seven".