28661201 has 4 divisors (see below), whose sum is σ = 30347172. Its totient is φ = 26975232.

The previous prime is 28661189. The next prime is 28661219. The reversal of 28661201 is 10216682.

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

It can be written as a sum of positive squares in 2 ways, for example, as 24760576 + 3900625 = 4976^2 + 1975^2 .

It is a cyclic number.

It is not a de Polignac number, because 28661201 - 2⁶ = 28661137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28661221) 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, 842960 + ... + 842993.

It is an arithmetic number, because the mean of its divisors is an integer number (7586793).

Almost surely, 2^28661201 is an apocalyptic number.

It is an amenable number.

28661201 is a deficient number, since it is larger than the sum of its proper divisors (1685971).

28661201 is a wasteful number, since it uses less digits than its factorization.

28661201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1685970.

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 28661201 is about 5353.6156940894. The cubic root of 28661201 is about 306.0305585555.

Adding to 28661201 its reverse (10216682), we get a palindrome (38877883).

The spelling of 28661201 in words is "twenty-eight million, six hundred sixty-one thousand, two hundred one".