28788761 has 4 divisors (see below), whose sum is σ = 29218512. Its totient is φ = 28359012.

The previous prime is 28788719. The next prime is 28788763. The reversal of 28788761 is 16788782.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 28788761 - 2²² = 24594457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28788763) 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, 214775 + ... + 214908.

It is an arithmetic number, because the mean of its divisors is an integer number (7304628).

Almost surely, 2^28788761 is an apocalyptic number.

It is an amenable number.

28788761 is a deficient number, since it is larger than the sum of its proper divisors (429751).

28788761 is an equidigital number, since it uses as much as digits as its factorization.

28788761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429750.

The product of its digits is 301056, while the sum is 47.

The square root of 28788761 is about 5365.5159118206. The cubic root of 28788761 is about 306.4838948450.

The spelling of 28788761 in words is "twenty-eight million, seven hundred eighty-eight thousand, seven hundred sixty-one".