28480311 has 6 divisors (see below), whose sum is σ = 41138240. Its totient is φ = 18986868.

The previous prime is 28480273. The next prime is 28480313. The reversal of 28480311 is 11308482.

It is not a de Polignac number, because 28480311 - 2¹⁵ = 28447543 is a prime.

It is a super-2 number, since 2×28480311² = 1622256229313442, 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 (28480313) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1582231 + ... + 1582248.

Almost surely, 2^28480311 is an apocalyptic number.

28480311 is a deficient number, since it is larger than the sum of its proper divisors (12657929).

28480311 is a wasteful number, since it uses less digits than its factorization.

28480311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3164485 (or 3164482 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 27.

The square root of 28480311 is about 5336.6947636154. The cubic root of 28480311 is about 305.3853804487.

Adding to 28480311 its reverse (11308482), we get a palindrome (39788793).

The spelling of 28480311 in words is "twenty-eight million, four hundred eighty thousand, three hundred eleven".