690728724 has 36 divisors (see below), whose sum is σ = 1995439264. Its totient is φ = 197350992.

The previous prime is 690728723. The next prime is 690728777. The reversal of 690728724 is 427827096.

690728724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (36).

It is a self number, because there is not a number n which added to its sum of digits gives 690728724.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 1370242 + ... + 1370745.

Almost surely, 2^690728724 is an apocalyptic number.

It is an amenable number.

690728724 is an abundant number, since it is smaller than the sum of its proper divisors (1304710540).

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

690728724 is a wasteful number, since it uses less digits than its factorization.

690728724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2741004 (or 2740999 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 690728724 is about 26281.7184369668. The cubic root of 690728724 is about 883.9665654178.

The spelling of 690728724 in words is "six hundred ninety million, seven hundred twenty-eight thousand, seven hundred twenty-four".