28731746 has 8 divisors (see below), whose sum is σ = 43493340. Its totient is φ = 14233968.

The previous prime is 28731739. The next prime is 28731749. The reversal of 28731746 is 64713782.

It can be written as a sum of positive squares in 2 ways, for example, as 25452025 + 3279721 = 5045^2 + 1811^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28731749) 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 in 3 ways as a sum of consecutive naturals, for example, 65681 + ... + 66116.

Almost surely, 2^28731746 is an apocalyptic number.

28731746 is a deficient number, since it is larger than the sum of its proper divisors (14761594).

28731746 is a wasteful number, since it uses less digits than its factorization.

28731746 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131908.

The product of its digits is 56448, while the sum is 38.

The square root of 28731746 is about 5360.2001828290. The cubic root of 28731746 is about 306.2814347297.

The spelling of 28731746 in words is "twenty-eight million, seven hundred thirty-one thousand, seven hundred forty-six".