28740971 has 8 divisors (see below), whose sum is σ = 33734880. Its totient is φ = 23969088.

The previous prime is 28740919. The next prime is 28740979. The reversal of 28740971 is 17904782.

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

It is a cyclic number.

It is not a de Polignac number, because 28740971 - 2²² = 24546667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28740979) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55226 + ... + 55743.

It is an arithmetic number, because the mean of its divisors is an integer number (4216860).

Almost surely, 2^28740971 is an apocalyptic number.

28740971 is a deficient number, since it is larger than the sum of its proper divisors (4993909).

28740971 is a wasteful number, since it uses less digits than its factorization.

28740971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111013.

The product of its (nonzero) digits is 28224, while the sum is 38.

The square root of 28740971 is about 5361.0606226753. The cubic root of 28740971 is about 306.3142108315.

The spelling of 28740971 in words is "twenty-eight million, seven hundred forty thousand, nine hundred seventy-one".