682491821 has 8 divisors (see below), whose sum is σ = 745413600. Its totient is φ = 619716240.

The previous prime is 682491787. The next prime is 682491827. The reversal of 682491821 is 128194286.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 682491821 - 2⁶ = 682491757 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 (682491827) 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, 26666 + ... + 45563.

It is an arithmetic number, because the mean of its divisors is an integer number (93176700).

Almost surely, 2^682491821 is an apocalyptic number.

It is an amenable number.

682491821 is a deficient number, since it is larger than the sum of its proper divisors (62921779).

682491821 is a wasteful number, since it uses less digits than its factorization.

682491821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73099.

The product of its digits is 55296, while the sum is 41.

The square root of 682491821 is about 26124.5444170803. The cubic root of 682491821 is about 880.4387537460.

The spelling of 682491821 in words is "six hundred eighty-two million, four hundred ninety-one thousand, eight hundred twenty-one".