1690278769 has 3 divisors (see below), whose sum is σ = 1690319883. Its totient is φ = 1690237656.

The previous prime is 1690278767. The next prime is 1690278791. The reversal of 1690278769 is 9678720961.

The square root of 1690278769 is 41113.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 1332615025 + 357663744 = 36505^2 + 18912^2 .

It is not a de Polignac number, because 1690278769 - 2¹ = 1690278767 is a prime.

It is a super-2 number, since 2×1690278769² = 5714084633864310722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1690278767) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 20557 + ... + 61669.

It is an arithmetic number, because the mean of its divisors is an integer number (563439961).

Almost surely, 2^1690278769 is an apocalyptic number.

1690278769 is the 41113-rd square number.

1690278769 is the 20557-th centered octagonal number.

It is an amenable number.

1690278769 is a deficient number, since it is larger than the sum of its proper divisors (41114).

1690278769 is an frugal number, since it uses more digits than its factorization.

1690278769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82226 (or 41113 counting only the distinct ones).

The product of its (nonzero) digits is 2286144, while the sum is 55.

The cubic root of 1690278769 is about 1191.2039151790.

The spelling of 1690278769 in words is "one billion, six hundred ninety million, two hundred seventy-eight thousand, seven hundred sixty-nine".