1690109988 has 96 divisors (see below), whose sum is σ = 4600243200. Its totient is φ = 472957056.

The previous prime is 1690109903. The next prime is 1690110011. The reversal of 1690109988 is 8899010961.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1690109988.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1967103 + ... + 1967961.

It is an arithmetic number, because the mean of its divisors is an integer number (47919200).

Almost surely, 2^1690109988 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1690109988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2300121600).

1690109988 is an abundant number, since it is smaller than the sum of its proper divisors (2910133212).

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

1690109988 is a wasteful number, since it uses less digits than its factorization.

1690109988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1329 (or 1327 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 51.

The square root of 1690109988 is about 41110.9473011751. The cubic root of 1690109988 is about 1191.1642650566.

The spelling of 1690109988 in words is "one billion, six hundred ninety million, one hundred nine thousand, nine hundred eighty-eight".