28149661 has 2 divisors, whose sum is σ = 28149662. Its totient is φ = 28149660.

The previous prime is 28149623. The next prime is 28149683. The reversal of 28149661 is 16694182.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26327161 + 1822500 = 5131^2 + 1350^2 .

It is a cyclic number.

It is not a de Polignac number, because 28149661 - 2¹³ = 28141469 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28149661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28149061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14074830 + 14074831.

It is an arithmetic number, because the mean of its divisors is an integer number (14074831).

Almost surely, 2^28149661 is an apocalyptic number.

It is an amenable number.

28149661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28149661 is an equidigital number, since it uses as much as digits as its factorization.

28149661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20736, while the sum is 37.

The square root of 28149661 is about 5305.6254108258. The cubic root of 28149661 is about 304.1989586616.

The spelling of 28149661 in words is "twenty-eight million, one hundred forty-nine thousand, six hundred sixty-one".