1697681680 has 20 divisors (see below), whose sum is σ = 3947110092. Its totient is φ = 679072640.

The previous prime is 1697681677. The next prime is 1697681707. The reversal of 1697681680 is 861867961.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 798401536 + 899280144 = 28256^2 + 29988^2 .

It is a tau number, because it is divible by the number of its divisors (20).

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, 10610431 + ... + 10610590.

Almost surely, 2^1697681680 is an apocalyptic number.

1697681680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1697681680 is an abundant number, since it is smaller than the sum of its proper divisors (2249428412).

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

1697681680 is a wasteful number, since it uses less digits than its factorization.

1697681680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21221034 (or 21221028 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 52.

The square root of 1697681680 is about 41202.9329053163. The cubic root of 1697681680 is about 1192.9404204267.

The spelling of 1697681680 in words is "one billion, six hundred ninety-seven million, six hundred eighty-one thousand, six hundred eighty".