680657439 has 64 divisors (see below), whose sum is σ = 1175473152. Its totient is φ = 340070400.

The previous prime is 680657437. The next prime is 680657447. The reversal of 680657439 is 934756086.

It is not a de Polignac number, because 680657439 - 2¹ = 680657437 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (680657437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 828649 + ... + 829469.

It is an arithmetic number, because the mean of its divisors is an integer number (18366768).

Almost surely, 2^680657439 is an apocalyptic number.

680657439 is a deficient number, since it is larger than the sum of its proper divisors (494815713).

680657439 is a wasteful number, since it uses less digits than its factorization.

680657439 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 976.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The square root of 680657439 is about 26089.4123927696. The cubic root of 680657439 is about 879.6492399436.

The spelling of 680657439 in words is "six hundred eighty million, six hundred fifty-seven thousand, four hundred thirty-nine".