690547968 has 162 divisors, whose sum is σ = 2189360082. Its totient is φ = 209172480.

The previous prime is 690547961. The next prime is 690547993. The reversal of 690547968 is 869745096.

690547968 is a `hidden beast` number, since 6 + 9 + 0 + 547 + 96 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 589906944 + 100641024 = 24288^2 + 10032^2 .

It is a super-2 number, since 2×690547968² = 953712992217858048, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690547961) by changing a digit.

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 17 ways as a sum of consecutive naturals, for example, 277546 + ... + 280022.

Almost surely, 2^690547968 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 690547968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1094680041).

690547968 is an abundant number, since it is smaller than the sum of its proper divisors (1498812114).

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

690547968 is a wasteful number, since it uses less digits than its factorization.

690547968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2521 (or 2493 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The square root of 690547968 is about 26278.2793957291. The cubic root of 690547968 is about 883.8894506284.

The spelling of 690547968 in words is "six hundred ninety million, five hundred forty-seven thousand, nine hundred sixty-eight".