1690878344 has 16 divisors (see below), whose sum is σ = 3356891100. Its totient is φ = 795707392.

The previous prime is 1690878323. The next prime is 1690878401. The reversal of 1690878344 is 4438780961.

It can be written as a sum of positive squares in 2 ways, for example, as 1667742244 + 23136100 = 40838^2 + 4810^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1690878292 and 1690878301.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6216329 + ... + 6216600.

Almost surely, 2^1690878344 is an apocalyptic number.

It is an amenable number.

1690878344 is a deficient number, since it is larger than the sum of its proper divisors (1666012756).

1690878344 is a wasteful number, since it uses less digits than its factorization.

1690878344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12432952 (or 12432948 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 1690878344 is about 41120.2911468292. The cubic root of 1690878344 is about 1191.3447463185.

The spelling of 1690878344 in words is "one billion, six hundred ninety million, eight hundred seventy-eight thousand, three hundred forty-four".