686825428 has 24 divisors (see below), whose sum is σ = 1209210912. Its totient is φ = 341344224.

The previous prime is 686825423. The next prime is 686825437. The reversal of 686825428 is 824528686.

It is a happy number.

686825428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686825423) 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, 614326 + ... + 615442.

It is an arithmetic number, because the mean of its divisors is an integer number (50383788).

Almost surely, 2^686825428 is an apocalyptic number.

It is an amenable number.

686825428 is a deficient number, since it is larger than the sum of its proper divisors (522385484).

686825428 is a wasteful number, since it uses less digits than its factorization.

686825428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1911 (or 1909 counting only the distinct ones).

The product of its digits is 1474560, while the sum is 49.

The square root of 686825428 is about 26207.3544639668. The cubic root of 686825428 is about 882.2983258364.

The spelling of 686825428 in words is "six hundred eighty-six million, eight hundred twenty-five thousand, four hundred twenty-eight".