28027751 has 4 divisors (see below), whose sum is σ = 28931904. Its totient is φ = 27123600.

The previous prime is 28027739. The next prime is 28027771. The reversal of 28027751 is 15772082.

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

It is a cyclic number.

It is not a de Polignac number, because 28027751 - 2¹⁴ = 28011367 is a prime.

It is a super-2 number, since 2×28027751² = 1571109652236002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28027711) 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, 452030 + ... + 452091.

It is an arithmetic number, because the mean of its divisors is an integer number (7232976).

Almost surely, 2^28027751 is an apocalyptic number.

28027751 is a deficient number, since it is larger than the sum of its proper divisors (904153).

28027751 is an equidigital number, since it uses as much as digits as its factorization.

28027751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 904152.

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 28027751 is about 5294.1241957476. The cubic root of 28027751 is about 303.7591835640.

The spelling of 28027751 in words is "twenty-eight million, twenty-seven thousand, seven hundred fifty-one".