1690252677 has 10 divisors (see below), whose sum is σ = 2524945478. Its totient is φ = 1126835064.

The previous prime is 1690252657. The next prime is 1690252679. The reversal of 1690252677 is 7762520961.

It can be written as a sum of positive squares in only one way, i.e., 1601120196 + 89132481 = 40014^2 + 9441^2 .

It is not a de Polignac number, because 1690252677 - 2⁷ = 1690252549 is a prime.

It is a super-2 number, since 2×1690252677² = 5713908224211332658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1690252679) by changing a digit.

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 9 ways as a sum of consecutive naturals, for example, 10433578 + ... + 10433739.

Almost surely, 2^1690252677 is an apocalyptic number.

It is an amenable number.

1690252677 is a deficient number, since it is larger than the sum of its proper divisors (834692801).

1690252677 is an equidigital number, since it uses as much as digits as its factorization.

1690252677 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20867329 (or 20867320 counting only the distinct ones).

The product of its (nonzero) digits is 317520, while the sum is 45.

The square root of 1690252677 is about 41112.6826782199. The cubic root of 1690252677 is about 1191.1977858050.

The spelling of 1690252677 in words is "one billion, six hundred ninety million, two hundred fifty-two thousand, six hundred seventy-seven".