28765312 has 16 divisors (see below), whose sum is σ = 57306150. Its totient is φ = 14382592.

The previous prime is 28765283. The next prime is 28765327. The reversal of 28765312 is 21356782.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 23270976 + 5494336 = 4824^2 + 2344^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 112237 + ... + 112492.

Almost surely, 2^28765312 is an apocalyptic number.

It is an amenable number.

28765312 is a deficient number, since it is larger than the sum of its proper divisors (28540838).

28765312 is an equidigital number, since it uses as much as digits as its factorization.

28765312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224743 (or 224731 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 28765312 is about 5363.3303086795. The cubic root of 28765312 is about 306.4006598981.

The spelling of 28765312 in words is "twenty-eight million, seven hundred sixty-five thousand, three hundred twelve".