690728722 has 16 divisors (see below), whose sum is σ = 1068143832. Its totient is φ = 334788480.

The previous prime is 690728719. The next prime is 690728723. The reversal of 690728722 is 227827096.

It is a happy number.

690728722 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 171845881 + 518882841 = 13109^2 + 22779^2 .

It is not an unprimeable number, because it can be changed into a prime (690728723) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13953 + ... + 39700.

Almost surely, 2^690728722 is an apocalyptic number.

690728722 is a deficient number, since it is larger than the sum of its proper divisors (377415110).

690728722 is a wasteful number, since it uses less digits than its factorization.

690728722 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53853.

The product of its (nonzero) digits is 169344, while the sum is 43.

The square root of 690728722 is about 26281.7183989175. The cubic root of 690728722 is about 883.9665645646.

The spelling of 690728722 in words is "six hundred ninety million, seven hundred twenty-eight thousand, seven hundred twenty-two".