680404705 has 8 divisors (see below), whose sum is σ = 823977000. Its totient is φ = 539329536.

The previous prime is 680404693. The next prime is 680404727. The reversal of 680404705 is 507404086.

It can be written as a sum of positive squares in 4 ways, for example, as 145130209 + 535274496 = 12047^2 + 23136^2 .

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 680404705 - 2¹³ = 680396513 is a prime.

It is a super-2 number, since 2×680404705² = 925901125172274050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 623680 + ... + 624769.

It is an arithmetic number, because the mean of its divisors is an integer number (102997125).

Almost surely, 2^680404705 is an apocalyptic number.

It is an amenable number.

680404705 is a deficient number, since it is larger than the sum of its proper divisors (143572295).

680404705 is a wasteful number, since it uses less digits than its factorization.

680404705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248563.

The product of its (nonzero) digits is 26880, while the sum is 34.

The square root of 680404705 is about 26084.5683307200. The cubic root of 680404705 is about 879.5403526728.

The spelling of 680404705 in words is "six hundred eighty million, four hundred four thousand, seven hundred five".