690857856 has 128 divisors (see below), whose sum is σ = 2195978400. Its totient is φ = 212557824.

The previous prime is 690857833. The next prime is 690857857. The reversal of 690857856 is 658758096.

690857856 is a `hidden beast` number, since 69 + 0 + 8 + 578 + 5 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690857857) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 37240 + ... + 52616.

Almost surely, 2^690857856 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 690857856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097989200).

690857856 is an abundant number, since it is smaller than the sum of its proper divisors (1505120544).

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

690857856 is a wasteful number, since it uses less digits than its factorization.

690857856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15413 (or 15395 counting only the distinct ones).

The product of its (nonzero) digits is 3628800, while the sum is 54.

The square root of 690857856 is about 26284.1750108311. The cubic root of 690857856 is about 884.0216479483.

The spelling of 690857856 in words is "six hundred ninety million, eight hundred fifty-seven thousand, eight hundred fifty-six".