1690689252 has 24 divisors (see below), whose sum is σ = 4508504896. Its totient is φ = 483054048.

The previous prime is 1690689233. The next prime is 1690689283. The reversal of 1690689252 is 2529860961.

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 7 ways as a sum of consecutive naturals, for example, 10063543 + ... + 10063710.

Almost surely, 2^1690689252 is an apocalyptic number.

1690689252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1690689252 is an abundant number, since it is smaller than the sum of its proper divisors (2817815644).

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

1690689252 is a wasteful number, since it uses less digits than its factorization.

1690689252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20127267 (or 20127265 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 48.

The square root of 1690689252 is about 41117.9918283955. The cubic root of 1690689252 is about 1191.3003350495.

The spelling of 1690689252 in words is "one billion, six hundred ninety million, six hundred eighty-nine thousand, two hundred fifty-two".