690728147 has 4 divisors (see below), whose sum is σ = 727082280. Its totient is φ = 654374016.

The previous prime is 690728089. The next prime is 690728149. The reversal of 690728147 is 741827096.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 690728147 - 2⁶ = 690728083 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 690728098 and 690728107.

It is not an unprimeable number, because it can be changed into a prime (690728149) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18177038 + ... + 18177075.

It is an arithmetic number, because the mean of its divisors is an integer number (181770570).

Almost surely, 2^690728147 is an apocalyptic number.

690728147 is a deficient number, since it is larger than the sum of its proper divisors (36354133).

690728147 is a wasteful number, since it uses less digits than its factorization.

690728147 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36354132.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 690728147 is about 26281.7074597523. The cubic root of 690728147 is about 883.9663192774.

The spelling of 690728147 in words is "six hundred ninety million, seven hundred twenty-eight thousand, one hundred forty-seven".