28298761 has 4 divisors (see below), whose sum is σ = 29963412. Its totient is φ = 26634112.

The previous prime is 28298749. The next prime is 28298783. The reversal of 28298761 is 16789282.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9114361 + 19184400 = 3019^2 + 4380^2 .

It is a cyclic number.

It is not a de Polignac number, because 28298761 - 2⁵ = 28298729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28298731) 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, 832300 + ... + 832333.

It is an arithmetic number, because the mean of its divisors is an integer number (7490853).

Almost surely, 2^28298761 is an apocalyptic number.

It is an amenable number.

28298761 is a deficient number, since it is larger than the sum of its proper divisors (1664651).

28298761 is a wasteful number, since it uses less digits than its factorization.

28298761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1664650.

The product of its digits is 96768, while the sum is 43.

The square root of 28298761 is about 5319.6579777275. The cubic root of 28298761 is about 304.7350956161.

The spelling of 28298761 in words is "twenty-eight million, two hundred ninety-eight thousand, seven hundred sixty-one".