1690378768 has 20 divisors (see below), whose sum is σ = 3527040748. Its totient is φ = 780174720.

The previous prime is 1690378717. The next prime is 1690378771. The reversal of 1690378768 is 8678730961.

It can be written as a sum of positive squares in 2 ways, for example, as 208744704 + 1481634064 = 14448^2 + 38492^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4063203 + ... + 4063618.

Almost surely, 2^1690378768 is an apocalyptic number.

It is an amenable number.

1690378768 is an abundant number, since it is smaller than the sum of its proper divisors (1836661980).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1690378768 is a wasteful number, since it uses less digits than its factorization.

1690378768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8126842 (or 8126836 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 55.

The square root of 1690378768 is about 41114.2161301903. The cubic root of 1690378768 is about 1191.2274057522.

The spelling of 1690378768 in words is "one billion, six hundred ninety million, three hundred seventy-eight thousand, seven hundred sixty-eight".