28851661 has 2 divisors, whose sum is σ = 28851662. Its totient is φ = 28851660.

The previous prime is 28851653. The next prime is 28851677. The reversal of 28851661 is 16615882.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 24314761 + 4536900 = 4931^2 + 2130^2 .

It is a cyclic number.

It is not a de Polignac number, because 28851661 - 2³ = 28851653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28851661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28851611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14425830 + 14425831.

It is an arithmetic number, because the mean of its divisors is an integer number (14425831).

Almost surely, 2^28851661 is an apocalyptic number.

It is an amenable number.

28851661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28851661 is an equidigital number, since it uses as much as digits as its factorization.

28851661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23040, while the sum is 37.

The square root of 28851661 is about 5371.3742189499. The cubic root of 28851661 is about 306.7069426990.

The spelling of 28851661 in words is "twenty-eight million, eight hundred fifty-one thousand, six hundred sixty-one".