1686748728 has 32 divisors (see below), whose sum is σ = 4819282560. Its totient is φ = 481928160.

The previous prime is 1686748727. The next prime is 1686748741. The reversal of 1686748728 is 8278476861.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1686748727) 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, 5019918 + ... + 5020253.

It is an arithmetic number, because the mean of its divisors is an integer number (150602580).

Almost surely, 2^1686748728 is an apocalyptic number.

It is an amenable number.

1686748728 is an abundant number, since it is smaller than the sum of its proper divisors (3132533832).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1686748728 is a wasteful number, since it uses less digits than its factorization.

1686748728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10040187 (or 10040183 counting only the distinct ones).

The product of its digits is 7225344, while the sum is 57.

The square root of 1686748728 is about 41070.0466033337. The cubic root of 1686748728 is about 1190.3740857193.

The spelling of 1686748728 in words is "one billion, six hundred eighty-six million, seven hundred forty-eight thousand, seven hundred twenty-eight".