28767730 has 8 divisors (see below), whose sum is σ = 51781932. Its totient is φ = 11507088.

The previous prime is 28767727. The next prime is 28767743. The reversal of 28767730 is 3776782.

It can be written as a sum of positive squares in 2 ways, for example, as 24930049 + 3837681 = 4993^2 + 1959^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1438377 + ... + 1438396.

Almost surely, 2^28767730 is an apocalyptic number.

28767730 is a deficient number, since it is larger than the sum of its proper divisors (23014202).

28767730 is a wasteful number, since it uses less digits than its factorization.

28767730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2876780.

The product of its (nonzero) digits is 98784, while the sum is 40.

The square root of 28767730 is about 5363.5557235849. Note that the first 3 decimals coincide. The cubic root of 28767730 is about 306.4092449610.

The spelling of 28767730 in words is "twenty-eight million, seven hundred sixty-seven thousand, seven hundred thirty".