680904521 has 16 divisors (see below), whose sum is σ = 751420800. Its totient is φ = 611867520.

The previous prime is 680904493. The next prime is 680904533. The reversal of 680904521 is 125409086.

It is not a de Polignac number, because 680904521 - 2¹⁰ = 680903497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (680904551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 380996 + ... + 382778.

It is an arithmetic number, because the mean of its divisors is an integer number (46963800).

Almost surely, 2^680904521 is an apocalyptic number.

It is an amenable number.

680904521 is a deficient number, since it is larger than the sum of its proper divisors (70516279).

680904521 is a wasteful number, since it uses less digits than its factorization.

680904521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2176.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 680904521 is about 26094.1472556587. The cubic root of 680904521 is about 879.7556660679.

The spelling of 680904521 in words is "six hundred eighty million, nine hundred four thousand, five hundred twenty-one".