1679639680 has 32 divisors (see below), whose sum is σ = 4015390140. Its totient is φ = 671855616.

The previous prime is 1679639677. The next prime is 1679639711. The reversal of 1679639680 is 869369761.

It can be written as a sum of positive squares in 2 ways, for example, as 1566259776 + 113379904 = 39576^2 + 10648^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1311579 + ... + 1312858.

Almost surely, 2^1679639680 is an apocalyptic number.

1679639680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1679639680 is an abundant number, since it is smaller than the sum of its proper divisors (2335750460).

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

1679639680 is an equidigital number, since it uses as much as digits as its factorization.

1679639680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2624456 (or 2624444 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 55.

The square root of 1679639680 is about 40983.4073742045. The cubic root of 1679639680 is about 1188.6993958268.

The spelling of 1679639680 in words is "one billion, six hundred seventy-nine million, six hundred thirty-nine thousand, six hundred eighty".