28540312 has 8 divisors (see below), whose sum is σ = 53513100. Its totient is φ = 14270152.

The previous prime is 28540307. The next prime is 28540313. The reversal of 28540312 is 21304582.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28540313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1783762 + ... + 1783777.

Almost surely, 2^28540312 is an apocalyptic number.

It is an amenable number.

28540312 is a deficient number, since it is larger than the sum of its proper divisors (24972788).

28540312 is a wasteful number, since it uses less digits than its factorization.

28540312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3567545 (or 3567541 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 28540312 is about 5342.3133565900. The cubic root of 28540312 is about 305.5996872798.

Adding to 28540312 its reverse (21304582), we get a palindrome (49844894).

The spelling of 28540312 in words is "twenty-eight million, five hundred forty thousand, three hundred twelve".