28744871 has 8 divisors (see below), whose sum is σ = 30633984. Its totient is φ = 26909080.

The previous prime is 28744831. The next prime is 28744873. The reversal of 28744871 is 17844782.

It is a happy number.

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

It is a de Polignac number, because none of the positive numbers 2^k-28744871 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 (28744873) 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, 12215 + ... + 14376.

It is an arithmetic number, because the mean of its divisors is an integer number (3829248).

Almost surely, 2^28744871 is an apocalyptic number.

28744871 is a deficient number, since it is larger than the sum of its proper divisors (1889113).

28744871 is a wasteful number, since it uses less digits than its factorization.

28744871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26661.

The product of its digits is 100352, while the sum is 41.

The square root of 28744871 is about 5361.4243443324. The cubic root of 28744871 is about 306.3280652856.

The spelling of 28744871 in words is "twenty-eight million, seven hundred forty-four thousand, eight hundred seventy-one".