1685971628 has 12 divisors (see below), whose sum is σ = 3218673192. Its totient is φ = 766350720.

The previous prime is 1685971607. The next prime is 1685971643. The reversal of 1685971628 is 8261795861.

It is a self number, because there is not a number n which added to its sum of digits gives 1685971628.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19158725 + ... + 19158812.

It is an arithmetic number, because the mean of its divisors is an integer number (268222766).

Almost surely, 2^1685971628 is an apocalyptic number.

It is an amenable number.

1685971628 is a deficient number, since it is larger than the sum of its proper divisors (1532701564).

1685971628 is a wasteful number, since it uses less digits than its factorization.

1685971628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38317552 (or 38317550 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 53.

The square root of 1685971628 is about 41060.5848472717. The cubic root of 1685971628 is about 1190.1912523625.

The spelling of 1685971628 in words is "one billion, six hundred eighty-five million, nine hundred seventy-one thousand, six hundred twenty-eight".