28750729 has 4 divisors (see below), whose sum is σ = 32857984. Its totient is φ = 24643476.

The previous prime is 28750727. The next prime is 28750741. The reversal of 28750729 is 92705782.

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 28750729 - 2¹ = 28750727 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28750691 and 28750700.

It is not an unprimeable number, because it can be changed into a prime (28750727) 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, 2053617 + ... + 2053630.

It is an arithmetic number, because the mean of its divisors is an integer number (8214496).

Almost surely, 2^28750729 is an apocalyptic number.

It is an amenable number.

28750729 is a deficient number, since it is larger than the sum of its proper divisors (4107255).

28750729 is an equidigital number, since it uses as much as digits as its factorization.

28750729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4107254.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 28750729 is about 5361.9706265514. The cubic root of 28750729 is about 306.3488730316.

The spelling of 28750729 in words is "twenty-eight million, seven hundred fifty thousand, seven hundred twenty-nine".