28863661 has 2 divisors, whose sum is σ = 28863662. Its totient is φ = 28863660.

The previous prime is 28863647. The next prime is 28863673. The reversal of 28863661 is 16636882.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28026436 + 837225 = 5294^2 + 915^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28863661 is a prime.

It is a super-2 number, since 2×28863661² = 1666221852645842, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28860661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14431830 + 14431831.

It is an arithmetic number, because the mean of its divisors is an integer number (14431831).

Almost surely, 2^28863661 is an apocalyptic number.

It is an amenable number.

28863661 is a deficient number, since it is larger than the sum of its proper divisors (1).

28863661 is an equidigital number, since it uses as much as digits as its factorization.

28863661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 82944, while the sum is 40.

The square root of 28863661 is about 5372.4911354045. The cubic root of 28863661 is about 306.7494587164.

The spelling of 28863661 in words is "twenty-eight million, eight hundred sixty-three thousand, six hundred sixty-one".