681628087 has 8 divisors (see below), whose sum is σ = 780212736. Its totient is φ = 583345752.

The previous prime is 681628067. The next prime is 681628111. The reversal of 681628087 is 780826186.

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 681628087 - 2¹⁵ = 681595319 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 (681628067) 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, 70723 + ... + 79780.

It is an arithmetic number, because the mean of its divisors is an integer number (97526592).

Almost surely, 2^681628087 is an apocalyptic number.

681628087 is a deficient number, since it is larger than the sum of its proper divisors (98584649).

681628087 is a wasteful number, since it uses less digits than its factorization.

681628087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151157.

The product of its (nonzero) digits is 258048, while the sum is 46.

The square root of 681628087 is about 26108.0081009640. The cubic root of 681628087 is about 880.0671810798.

The spelling of 681628087 in words is "six hundred eighty-one million, six hundred twenty-eight thousand, eighty-seven".