1690742708 has 6 divisors (see below), whose sum is σ = 2958799746. Its totient is φ = 845371352.

The previous prime is 1690742699. The next prime is 1690742743. The reversal of 1690742708 is 8072470961.

It can be written as a sum of positive squares in only one way, i.e., 1259682064 + 431060644 = 35492^2 + 20762^2 .

It is a super-2 number, since 2×1690742708² = 5717221809310346528, which contains 22 as substring.

It is a congruent 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 as a sum of consecutive naturals, namely, 211342835 + ... + 211342842.

It is an arithmetic number, because the mean of its divisors is an integer number (493133291).

Almost surely, 2^1690742708 is an apocalyptic number.

It is an amenable number.

1690742708 is a deficient number, since it is larger than the sum of its proper divisors (1268057038).

1690742708 is a wasteful number, since it uses less digits than its factorization.

1690742708 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422685681 (or 422685679 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 1690742708 is about 41118.6418550029. The cubic root of 1690742708 is about 1191.3128903786.

The spelling of 1690742708 in words is "one billion, six hundred ninety million, seven hundred forty-two thousand, seven hundred eight".