1690020908 has 6 divisors (see below), whose sum is σ = 2957536596. Its totient is φ = 845010452.

The previous prime is 1690020889. The next prime is 1690020919. The reversal of 1690020908 is 8090200961.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211252610 + ... + 211252617.

It is an arithmetic number, because the mean of its divisors is an integer number (492922766).

Almost surely, 2^1690020908 is an apocalyptic number.

It is an amenable number.

1690020908 is a deficient number, since it is larger than the sum of its proper divisors (1267515688).

1690020908 is a wasteful number, since it uses less digits than its factorization.

1690020908 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422505231 (or 422505229 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The square root of 1690020908 is about 41109.8638771767. The cubic root of 1690020908 is about 1191.1433372713.

The spelling of 1690020908 in words is "one billion, six hundred ninety million, twenty thousand, nine hundred eight".