1697663988 has 48 divisors (see below), whose sum is σ = 4484410560. Its totient is φ = 555208992.

The previous prime is 1697663959. The next prime is 1697664049. The reversal of 1697663988 is 8893667961.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142570 + ... + 154017.

It is an arithmetic number, because the mean of its divisors is an integer number (93425220).

Almost surely, 2^1697663988 is an apocalyptic number.

1697663988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1697663988 is an abundant number, since it is smaller than the sum of its proper divisors (2786746572).

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

1697663988 is a wasteful number, since it uses less digits than its factorization.

1697663988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296653 (or 296645 counting only the distinct ones).

The product of its digits is 23514624, while the sum is 63.

The square root of 1697663988 is about 41202.7182113025. The cubic root of 1697663988 is about 1192.9362764274.

The spelling of 1697663988 in words is "one billion, six hundred ninety-seven million, six hundred sixty-three thousand, nine hundred eighty-eight".