28730749 has 4 divisors (see below), whose sum is σ = 29979936. Its totient is φ = 27481564.

The previous prime is 28730729. The next prime is 28730761. The reversal of 28730749 is 94703782.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28730749 - 2⁷ = 28730621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28730719) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624559 + ... + 624604.

It is an arithmetic number, because the mean of its divisors is an integer number (7494984).

Almost surely, 2^28730749 is an apocalyptic number.

It is an amenable number.

28730749 is a deficient number, since it is larger than the sum of its proper divisors (1249187).

28730749 is a wasteful number, since it uses less digits than its factorization.

28730749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1249186.

The product of its (nonzero) digits is 84672, while the sum is 40.

The square root of 28730749 is about 5360.1071817642. The cubic root of 28730749 is about 306.2778920036.

The spelling of 28730749 in words is "twenty-eight million, seven hundred thirty thousand, seven hundred forty-nine".