690263784 has 216 divisors, whose sum is σ = 2313542790. Its totient is φ = 185342976.

The previous prime is 690263753. The next prime is 690263809. The reversal of 690263784 is 487362096.

690263784 is a `hidden beast` number, since 6 + 9 + 0 + 2 + 637 + 8 + 4 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 645668100 + 44595684 = 25410^2 + 6678^2 .

It is an unprimeable number.

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 53 ways as a sum of consecutive naturals, for example, 1019254 + ... + 1019930.

Almost surely, 2^690263784 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690263784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1156771395).

690263784 is an abundant number, since it is smaller than the sum of its proper divisors (1623279006).

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

690263784 is a wasteful number, since it uses less digits than its factorization.

690263784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 737 (or 706 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 690263784 is about 26272.8716359670. The cubic root of 690263784 is about 883.7681837908.

The spelling of 690263784 in words is "six hundred ninety million, two hundred sixty-three thousand, seven hundred eighty-four".