28728992 has 12 divisors (see below), whose sum is σ = 56560266. Its totient is φ = 14364480.

The previous prime is 28728991. The next prime is 28729003. The reversal of 28728992 is 29982782.

It can be written as a sum of positive squares in only one way, i.e., 26666896 + 2062096 = 5164^2 + 1436^2 .

It is not an unprimeable number, because it can be changed into a prime (28728991) 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 as a sum of consecutive naturals, namely, 448859 + ... + 448922.

Almost surely, 2^28728992 is an apocalyptic number.

It is an amenable number.

28728992 is a deficient number, since it is larger than the sum of its proper divisors (27831274).

28728992 is an equidigital number, since it uses as much as digits as its factorization.

28728992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897791 (or 897783 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 28728992 is about 5359.9432832820. The cubic root of 28728992 is about 306.2716485044.

The spelling of 28728992 in words is "twenty-eight million, seven hundred twenty-eight thousand, nine hundred ninety-two".