28480312 has 16 divisors (see below), whose sum is σ = 61029360. Its totient is φ = 12205824.

The previous prime is 28480273. The next prime is 28480313. The reversal of 28480312 is 21308482.

It is a super-2 number, since 2×28480312² = 1622256343234688, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

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 3 ways as a sum of consecutive naturals, for example, 254233 + ... + 254344.

It is an arithmetic number, because the mean of its divisors is an integer number (3814335).

Almost surely, 2^28480312 is an apocalyptic number.

It is an amenable number.

28480312 is an abundant number, since it is smaller than the sum of its proper divisors (32549048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28480312 is a wasteful number, since it uses less digits than its factorization.

28480312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508590 (or 508586 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 28480312 is about 5336.6948573063. The cubic root of 28480312 is about 305.3853840229.

Adding to 28480312 its reverse (21308482), we get a palindrome (49788794).

The spelling of 28480312 in words is "twenty-eight million, four hundred eighty thousand, three hundred twelve".