1680907890 has 32 divisors (see below), whose sum is σ = 4047341760. Its totient is φ = 446779584.

The previous prime is 1680907871. The next prime is 1680907897. The reversal of 1680907890 is 987090861.

It is a happy number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1680907897) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 82045 + ... + 100464.

It is an arithmetic number, because the mean of its divisors is an integer number (126479430).

Almost surely, 2^1680907890 is an apocalyptic number.

1680907890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1680907890 is an abundant number, since it is smaller than the sum of its proper divisors (2366433870).

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

1680907890 is a wasteful number, since it uses less digits than its factorization.

1680907890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182826.

The product of its (nonzero) digits is 217728, while the sum is 48.

The square root of 1680907890 is about 40998.8766919290. The cubic root of 1680907890 is about 1188.9984959295.

The spelling of 1680907890 in words is "one billion, six hundred eighty million, nine hundred seven thousand, eight hundred ninety".