28488077 has 4 divisors (see below), whose sum is σ = 28558140. Its totient is φ = 28418016.

The previous prime is 28488067. The next prime is 28488127. The reversal of 28488077 is 77088482.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 77088482 = 2 ⋅38544241.

It can be written as a sum of positive squares in 2 ways, for example, as 26977636 + 1510441 = 5194^2 + 1229^2 .

It is a cyclic number.

It is not a de Polignac number, because 28488077 - 2¹⁴ = 28471693 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 (28488017) 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 3 ways as a sum of consecutive naturals, for example, 34418 + ... + 35235.

It is an arithmetic number, because the mean of its divisors is an integer number (7139535).

Almost surely, 2^28488077 is an apocalyptic number.

It is an amenable number.

28488077 is a deficient number, since it is larger than the sum of its proper divisors (70063).

28488077 is an equidigital number, since it uses as much as digits as its factorization.

28488077 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70062.

The product of its (nonzero) digits is 200704, while the sum is 44.

The square root of 28488077 is about 5337.4223179359. The cubic root of 28488077 is about 305.4131353812.

The spelling of 28488077 in words is "twenty-eight million, four hundred eighty-eight thousand, seventy-seven".