1690742706 has 8 divisors (see below), whose sum is σ = 3381485424. Its totient is φ = 563580900.

The previous prime is 1690742699. The next prime is 1690742743. The reversal of 1690742706 is 6072470961.

It is a sphenic number, since it is the product of 3 distinct primes.

1690742706 is an admirable number.

It is a super-2 number, since 2×1690742706² = 5717221795784404872, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

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 3 ways as a sum of consecutive naturals, for example, 140895220 + ... + 140895231.

It is an arithmetic number, because the mean of its divisors is an integer number (422685678).

Almost surely, 2^1690742706 is an apocalyptic number.

1690742706 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1690742706 is a wasteful number, since it uses less digits than its factorization.

1690742706 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 281790456.

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 1690742706 is about 41118.6418306831. The cubic root of 1690742706 is about 1191.3128899088.

The spelling of 1690742706 in words is "one billion, six hundred ninety million, seven hundred forty-two thousand, seven hundred six".