28742871 has 16 divisors (see below), whose sum is σ = 38997504. Its totient is φ = 18828384.

The previous prime is 28742867. The next prime is 28742873. The reversal of 28742871 is 17824782.

It is not a de Polignac number, because 28742871 - 2² = 28742867 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28742873) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51325 + ... + 51881.

It is an arithmetic number, because the mean of its divisors is an integer number (2437344).

Almost surely, 2^28742871 is an apocalyptic number.

28742871 is a deficient number, since it is larger than the sum of its proper divisors (10254633).

28742871 is a wasteful number, since it uses less digits than its factorization.

28742871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 830.

The product of its digits is 50176, while the sum is 39.

The square root of 28742871 is about 5361.2378234882. The cubic root of 28742871 is about 306.3209605939.

The spelling of 28742871 in words is "twenty-eight million, seven hundred forty-two thousand, eight hundred seventy-one".