28963661 has 2 divisors, whose sum is σ = 28963662. Its totient is φ = 28963660.

The previous prime is 28963651. The next prime is 28963673. The reversal of 28963661 is 16636982.

28963661 = 3805² + 3806².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14485636 + 14478025 = 3806^2 + 3805^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28963661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28963651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14481830 + 14481831.

It is an arithmetic number, because the mean of its divisors is an integer number (14481831).

Almost surely, 2^28963661 is an apocalyptic number.

28963661 is the 3806-th centered square number.

It is an amenable number.

28963661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28963661 is an equidigital number, since it uses as much as digits as its factorization.

28963661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 41.

The square root of 28963661 is about 5381.7897580638. The cubic root of 28963661 is about 307.1033014346.

The spelling of 28963661 in words is "twenty-eight million, nine hundred sixty-three thousand, six hundred sixty-one".