1690730557 has 8 divisors (see below), whose sum is σ = 1701834840. Its totient is φ = 1679641920.

The previous prime is 1690730549. The next prime is 1690730677. The reversal of 1690730557 is 7550370961.

It can be written as a sum of positive squares in 4 ways, for example, as 1254505561 + 436224996 = 35419^2 + 20886^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1690730557 - 2³ = 1690730549 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690730857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277419 + ... + 283447.

It is an arithmetic number, because the mean of its divisors is an integer number (212729355).

Almost surely, 2^1690730557 is an apocalyptic number.

It is an amenable number.

1690730557 is a deficient number, since it is larger than the sum of its proper divisors (11104283).

1690730557 is a wasteful number, since it uses less digits than its factorization.

1690730557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7823.

The product of its (nonzero) digits is 198450, while the sum is 43.

The square root of 1690730557 is about 41118.4940993709. The cubic root of 1690730557 is about 1191.3100364696.

The spelling of 1690730557 in words is "one billion, six hundred ninety million, seven hundred thirty thousand, five hundred fifty-seven".