1688699080 has 32 divisors (see below), whose sum is σ = 4023078840. Its totient is φ = 635745280.

The previous prime is 1688699069. The next prime is 1688699101. The reversal of 1688699080 is 809968861.

It can be written as a sum of positive squares in 4 ways, for example, as 1680508036 + 8191044 = 40994^2 + 2862^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1241011 + ... + 1242370.

Almost surely, 2^1688699080 is an apocalyptic number.

1688699080 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1688699080 is an abundant number, since it is smaller than the sum of its proper divisors (2334379760).

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

1688699080 is a wasteful number, since it uses less digits than its factorization.

1688699080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2483409 (or 2483405 counting only the distinct ones).

The product of its (nonzero) digits is 1492992, while the sum is 55.

The square root of 1688699080 is about 41093.7839581609. The cubic root of 1688699080 is about 1190.8327104867.

The spelling of 1688699080 in words is "one billion, six hundred eighty-eight million, six hundred ninety-nine thousand, eighty".