28006357201 has 9 divisors (see below), whose sum is σ = 28790108571. Its totient is φ = 27243403992.

The previous prime is 28006357199. The next prime is 28006357207. The reversal of 28006357201 is 10275360082.

It is a happy number.

The square root of 28006357201 is 167351.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 25060473025 + 2945884176 = 158305^2 + 54276^2 .

It is not a de Polignac number, because 28006357201 - 2¹ = 28006357199 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28006357207) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6189726 + ... + 6194248.

Almost surely, 2^28006357201 is an apocalyptic number.

28006357201 is the 167351-st square number.

28006357201 is the 83676-th centered octagonal number.

It is an amenable number.

28006357201 is a deficient number, since it is larger than the sum of its proper divisors (783751370).

28006357201 is an frugal number, since it uses more digits than its factorization.

28006357201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9120 (or 4560 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 28006357201 in words is "twenty-eight billion, six million, three hundred fifty-seven thousand, two hundred one".