1681692990 has 16 divisors (see below), whose sum is σ = 4036063248. Its totient is φ = 448451456.

The previous prime is 1681692967. The next prime is 1681692997. The reversal of 1681692990 is 992961861.

1681692990 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681692997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28028187 + ... + 28028246.

It is an arithmetic number, because the mean of its divisors is an integer number (252253953).

Almost surely, 2^1681692990 is an apocalyptic number.

1681692990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1681692990 is an abundant number, since it is smaller than the sum of its proper divisors (2354370258).

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

1681692990 is a wasteful number, since it uses less digits than its factorization.

1681692990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56056443.

The product of its (nonzero) digits is 419904, while the sum is 51.

The square root of 1681692990 is about 41008.4502267520. The cubic root of 1681692990 is about 1189.1835819037.

The spelling of 1681692990 in words is "one billion, six hundred eighty-one million, six hundred ninety-two thousand, nine hundred ninety".