28660261 has 4 divisors (see below), whose sum is σ = 32754592. Its totient is φ = 24565932.

The previous prime is 28660243. The next prime is 28660279. The reversal of 28660261 is 16206682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (28660243) and next prime (28660279).

It is a cyclic number.

It is not a de Polignac number, because 28660261 - 2⁹ = 28659749 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28660211) 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, 2047155 + ... + 2047168.

It is an arithmetic number, because the mean of its divisors is an integer number (8188648).

Almost surely, 2^28660261 is an apocalyptic number.

It is an amenable number.

28660261 is a deficient number, since it is larger than the sum of its proper divisors (4094331).

28660261 is an equidigital number, since it uses as much as digits as its factorization.

28660261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4094330.

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 28660261 is about 5353.5279022342. The cubic root of 28660261 is about 306.0272128959.

The spelling of 28660261 in words is "twenty-eight million, six hundred sixty thousand, two hundred sixty-one".