28051261 has 8 divisors (see below), whose sum is σ = 32445504. Its totient is φ = 23753760.

The previous prime is 28051253. The next prime is 28051273. The reversal of 28051261 is 16215082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28051261 - 2³ = 28051253 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28051211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23560 + ... + 24721.

It is an arithmetic number, because the mean of its divisors is an integer number (4055688).

Almost surely, 2^28051261 is an apocalyptic number.

It is an amenable number.

28051261 is a deficient number, since it is larger than the sum of its proper divisors (4394243).

28051261 is an equidigital number, since it uses as much as digits as its factorization.

28051261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48371.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 28051261 is about 5296.3441164637. The cubic root of 28051261 is about 303.8440920603.

The spelling of 28051261 in words is "twenty-eight million, fifty-one thousand, two hundred sixty-one".